'Only Fools and Horses' won't return for new episodes, insist the show creator's sons.
Jim and Dan Sullivan won't revive their father John's hit sitcom - which aired on BBC One between 1981 and 2003 - following his death in 2011, despite recently penning a Sport Relief charity special starring David Beckham.
Jim told Radio Times magazine: "It's a relief now it's done as we were all sworn to secrecy for what felt like a long time. It's also good to be able to set the record straight about some of the rumours - that the sketch is a trailer for a new episode, that we're writing a new series etc. None of it is true.
"It really is a one-off sketch. We very much appreciate the passionate and loyal fanbase that the show has and in a perfect world there would be more episodes, but there was only ever one writer of 'Only Fools and Horses', and without him, there can be no more."
The brothers are both screenwriters and Jim wrote several episodes of 'Only Fools' spin-off 'The Green Green Grass'.
Dan and Jim admit they were reluctant to revive the show for the charity sketch but eventually decided to honour their father by inserting lines he had written in the past in the new script.
Jim said: "We checked dad's notes - snippets of dialogue he'd written but never found a place for - and worked it into the script. This wasn't easy because anything we added had to feel natural and unforced."

ITV are "thrilled" to have Cheryl Cole return to the 'X Factor' judging panel.
The 30-year-old star will reprise her role as a judge on the talent show for its eleventh series later this year, and ITV are delighted to have her on board since she was extremely popular when she first appeared on the show in 2008.
Elaine Bedell, Director of Comedy and Entertainment, said: "We're thrilled to be announcing Cheryl's return to 'The X Factor' panel.
"She was an extremely popular judge who struck a real chord with our viewers, and we're looking forward to welcoming her back on screen this autumn."
The 'Call My Name' hitmaker - who led Alexandra Burke and Joe McElderry to victory in 2008 and 2009 respectively - left the show in 2011 in order to join Simon Cowell on the US version of 'The X Factor', but was swiftly axed from the show.
Cheryl famously had a public falling out with Simon over her dismissal, but they recently reconciled and she is now is excited at the prospect of finding new talent.
She said: "I'm very happy and excited to be returning to 'The X Factor'. I'm inspired and ready to find new talent and potential pop stars. It's going to be a fun series."
Show boss Simon - who is also returning as a judge later this year - made no secret of the fact he wanted the brunette beauty back.
He said: "I am so happy that Cheryl has agreed to join 'The X Factor' again. The last time we worked together in the UK was incredible and produced some really successful artists. Obviously the plan is to do the same again... so it's back to work!"
It has not yet been confirmed who will take up the remaining two spots on the panel, although Irish music manager Louis Walsh is rumoured to be returning.

Ciara has spent $20,000 on a safari-themed nursery for her unborn child.
The 'Goodies' singer - who is due to give birth to her first child with her fiance, rapper Future, next month - embarked on an extensive shopping spree at pricey baby store Petit Tresor in Los Angeles, coming away with a host of stuffed animals, lion bookends and art work, including a $1,800 8-foot stuffed giraffe, TMZ reports.
The extravagant spree isn't the first time in recent months Ciara has been spotted flashing her cash for her unborn baby.
The 29-year-old star was spotted at another baby boutique, Bel Bambini, with friend Kim Kardashian in Hollywood last month.
The reality TV star is a "regular" at the store as she regularly shops there for her and Kanye West's nine-month-old daughter North.
A source said: "Kim is a regular here and she was showing Ciara around, helping her pick out a few items in anticipation of her baby's arrival. They looked at a few different cribs and bedding designs and also some feeding apparatuses that we carry. They were both upbeat, smiling and sharing the joys of being pregnant. It was a nice moment for the girls and we adore them."
As well as planning for her baby, Ciara is also getting ready for her wedding later in the year but is yet to decide on all the details of her big day.
She has previously said: "I still want it to be a fun process, but I want the dress to be perfect, I want the cake to be perfect, I want the food to be perfect."

Kristen Bell peed in a jar before this year's Academy Awards.
The 33-year-old actress was forced to relieve herself in an unconventional manner before making her way to the 2014 Oscars ceremony in Hollywood earlier this month because her stunning Roberto Cavalli gown made visiting the bathroom difficult.
Speaking of the uncomfortable corseted designer dress to co-host Michael Strahan on 'Live With Kelly and Michael' last night (09.03.14), she said: "Nope, [it wasn't comfortable] and I didn't realise that until I got into it.
"There was a situation ... there was a Mason jar involved."
As the audience laughed she added: "Like you guys haven't peed into a Mason jar before in a huge ball gown!"
The 'Frozen' star - who made her debut appearance at this year's awards - also made the mistake of not eating enough before the big night because she didn't realise how long the evening would be.
She said: "This was my first time going ... You have a hair and a make-up person, [so] by the time you get into the dress you realise that you've been sitting there for like three hours. And then there's always traffic, so that's almost four hours. Then you get there and that's why everyone in the audience looks emaciated, because everyone's hungry!"
Luckily for this year's attendees, host Ellen DeGeneres ordered a round of pizzas during the show to feed the ravenous audience.

Kris Jenner claims she played a "major role" in planning Kanye West's proposal to Kim Kardashian.
The showbiz matriarch insists she was "directly involved" in arranging the lavish engagement at San Francisco's AT&T Park last October and had a key role in getting all their loved ones together.
In a court declaration in Kim and Kanye's lawsuit against YouTube co-founder Chad Hurley - who they claim illegally leaked footage of the proposal - Kris said: "I played a major role in organising and running the event.
"As part of this. I was directly involved in formulating and was familiar with the guest list."
In her declaration, Kris went on to say Chad had attended the proposal "event" - which boasted a 50-piece orchestra, champagne and fireworks - with an invited guest, but was not a friend of the family.
In documents obtained by RadarOnline.com, she said: "[Chad] did show up with someone else who was an invited guest, bur Mr. Hurley was not invited by the organisers of the event.
"He was not even invited to attend; Kim and Kanye did not know him.
"We would not have been upset in the least if he had to leave -- or never even attended in the first place -- and he had not earned the trust of Kim, Kanye, or me."
The couple had sold the rights to broadcast the proposal - which aired recently on 'Keeping Up with the Kardashians' - at a high price on an "exclusive basis" and in her declaration, Kim insisted the leaked footage would "diminish" the value of the official film.
She went on to add: "There were certainly tweets and other written messages about the event and a small number of snapshot photos and other brief images appeared, but there were no photos of the marriage proposal itself.
"Importantly, there were certainly no videos of the marriage proposal that were publicly broadcast at the time that Mr. Hurley posted his video footage."
A hearing has been set for March 18, to determine if the lawsuit will proceed to trial.

Katie Price doesn't use contraception.
The former glamour model - who has children Harvey, 11, Junior, eight, and Princess, six, from previous relationships and five-month-old Jett with husband Kieran Hayler - laughed off claims she is already planning to have another baby, insisting the "last thing" her busy household needs is another youngster, though she admits she and her spouse have unprotected sex.
She said: "I was amused to hear that a mag says I'm trying for a baby girl. Jett is only six months and I haven't got my body back yet! The last thing I need right now is another screaming baby. It's true I don't use contraception but I'm not planning to get pregnant and I'm not on a special baby diet."
While she's not trying for another daughter, Katie, 35, has been asked to be a godparent to her close friends daughter Lily-Belle and is delighted to be close enough to watch the tiny tot grow up.
She added in her column for Now magazine: "This week my friend Abi and her fiancé Greg welcomed Lily-Belle into the world. I've been asked to be her godmother - I cant wait to watch this gorgeous girl grow up!"

Britain's Prince Harry has congratulated a crew of servicemen who rowed across the Atlantic Ocean.
The 29-year-old Royal presented the crew of injured and able-bodied servicemen, who completed the gruelling task of rowing an estimated 3,000 miles in 48 days, with medals at the River and Rowing Museum in Henley-on-Thames, south-east England, yesterday (10.03.14).
The Prince supported the men in the run-up to their journey and even telephoned them to wish them luck while he was taking part in his own challenge of trekking to the South Pole with another group of injured servicemen and women.
Harry caught up with the four men - whose adventure was sponsored by the Row2Recovery charity, which raises funds for wounded troops and their families - and exchanged stories from their trips.
Former Olympic rowing star Sir Steve Redgrave also attended the medal presentation and praised the crew - which included Trooper Cayle Royce, Corporal Scott Blaney and Captain's Mark Jenkins and James Kayll - for their courage and effort, and insisted he could never have completed such a difficult challenge.
He said: "I'm pretty proud of my five gold medals and they've got their Atlantic medals which I know I'm never going to get but I'm happy with that.
"The longest I ever spent in a boat was three hours and mentally I could just cope with that, to spend days and nights over and over again in a boat I could not cope with that.
"Their biggest strength is their mental strength."

Britain's Duchess of Cornwall will become the Patron of the Medical Detection Dogs charity today (11.03.14).
Camilla, Duchess of Cornwall - who is the Prince of Wales' second wife - has given the organisation the royal stamp of approval and will formally commence her Patronage at a reception at St James's Palace in London this afternoon (11.03.14).
Her husband, Prince Charles, will also attend the ceremony to show his support for the cause, which is to train dogs in the detection and recognition of human disease.
Speaking about the royal appointment, Dr. Claire Guest of the Medical Detection Dogs organisation told the Milton Keynes Citizen newspaper: "Her support will be invaluable for a ground-breaking and innovative charity such as ours, to promote the work we do, supporting those with life threatening health conditions and advancing cancer detection work through odour.
"Her appointment will be warmly welcomed by our staff and volunteers and I hope that Her Royal Highness will find her involvement with us extremely rewarding."
The Duchess is also involved in a number of other charities, mainly associated with health, including the National Osteoporosis Society for which she has been the President since 2001 and Maggie's Cancer Caring Centres for which she is also President.

Britain's Prince Harry was "terrified" of embarking on his charity trek to the South Pole.
The flame-haired Royal joined a team of 12 servicemen and women from the United Kingdom and other nations on a race of more than 200 miles across the Antarctic in December last year while being filmed for an ITV documentary, and he admitted before he set off that he was worried about letting his teammates down.
According to this week's edition of the Radio Times magazine, Harry said: "I'm terrified for myself, to be honest - hugely daunted.
"I don't want to let the side down through fitness or injuries or anything like that. There's a lot of pressure on everybody involved, so I've just got to get it right... It's not just about fitness, it's about knowing exactly what you can and can't do."
The 29-year-old Prince took part in the Walking With The Wounded expedition with a number of servicemen and women who have lost limbs during combat, and he claimed that their strength inspired him to do better.
He added: "You've just got to push on, you shouldn't give up - and these guys don't. That's what's driving me."
The first instalment of 'Harry's South Pole Heroes' will be shown on ITV in the UK on Sunday (16.03.14).

Britain's Princess Royal will visit Wiltshire next month to present the Queen's Award for Voluntary Service.
The 63-year-old Royal is expected to pay a visit to the small town of Devizes in the west of England to attend the headquarters of the Kennet and Avon Canal Trust, where she will present the foundation with their honour - which was awarded to them in last year's Queen's Birthday Honours List - on April 7.
Chairman of the trust, Rob Dean, told the Wiltshire Gazette and Herald: "She will meet about 50 of our volunteers and staff members but there will be a lot more of them at the Wharf to welcome her.
"We are absolutely delighted that she is coming to present the award in person. It means a lot to us."
During the trip, Princess Anne - who is Queen Elizabeth's only daughter - will also enjoy a short narrowboat trip prior to her meeting at the trust, which will then be followed by her official opening of the new Bronze Age galleries at the Wiltshire Museum.
The Princess will then complete her tour of the town with a reception in the town hall for the local, and one of the longest running branches, of the Save the Children charity for which she is President.
The short trip will not be Anne's first visit to Devizes however, as she presented the keynote address at a conference for carers in 2007 and prior to that inaugurated a housing estate on the grounds of a former hospital and visited Canon's House children's home in 1999.

David Beckham can "die a happy man" after shooting a sketch for 'Only Fools and Horses'.
The retired soccer player is set to star alongside Sir David Jason and Nicholas Lyndhurst in a one-off special of the classic sitcom - which ran on BBC One from 1981 and 2003 - for the Sport Relief charity, and he says it was surreal to be on set with Del Boy and Rodney having grown up watching the show.
David gushed to Radio Times magazine: "I can die a happy man after these two days [of filming]. I think that what it's really about is making people laugh, making people smile and raising money for important charities that are doing a lot of incredible work."
The 38-year-old hunk admits he was incredibly nervous the night before filming the sketch and coming face-to-face with his favourite TV characters.
He explained: "The day of filming started off with a slightly sleepless night, going over my script. The thought of being on set with Nicholas and David was obviously very nerve-racking.
"I woke up that morning with my script on my chest. I've never done anything like this before, especially with two people I'm really in awe of and have been for many years.
"It wasn't just about learning the script, it was about delivering it, saying the right things at the right time."

Verity Rushworth has put her honeymoon on hold to return to 'Emmerdale'.
The actress is set to return to the ITV soap this month for the first time since 2009 as cheating cop Donna Dingle and she says the role is so important to her that she has postponed her plans to celebrate her union with theatre director Dominic Shaw in the Maldives.
She explained to The Sun newspaper: "We want to do something really special, like fly off to the Maldives. We were thinking about this year, when my show finished, then this job came up and I just had to do it, so we've still not got there.
"I've put my honeymoon on hold for 'Emmerdale', which shows how much I want to do it! We've started filming and it is hectic already. But he gets I'm working all the time because he is usually doing the same. We are together one day a week always, which is just the way it's always been and helps to keep things fresh."
Verity has pursued a stage career since leaving the soap, with roles in 'The Sound of Music' and 'Chicago', but insists returning to the set felt as natural as coming "home".
She added: "Once we started filming again it was like I'd never been away - it felt like coming home... Donna's changed a bit. She's more mature and a mum.
"She's skinny jeans and striped tops these days - but as a person she's the same so I hope the viewers will enjoy seeing her back in the village again."