David Walliams admits he and Matt Lucas have always had a difficult working relationship.
The comedy duo have worked together on hit shows such as 'Rock Profile', 'Little Britain' and 'Come Fly With Me' but David admits their partnership hasn't always been easy because they have different work ethics.
Speaking about when they first met in 1992, David recalled: "I had always wanted to work with someone more talented than I was. Matt certainly was. What's more, we had become like brothers, so I proposed we do a comedy show together.
"Our first difficulty was that Matt did not want to start work until three in the afternoon. 'I have gigs in the evening and it takes me a long time to wind down after all the adrenalin'. he said."
David also says he and Matt clashed when they were first writing sketches for 'Little Britain', which included the character of Daffyd.
Writing in his autobiography 'Camp David', which is being serialised in The Sun newspaper, David said: "We sat in Matt's office for a couple of days trying to think of something that would bind our sketches together. Finally we came up with an idea to base it on life in modern Britain.
"Together we wrote the first Daffyd sketch for this script. Amazingly, neither our producer, Myfanwy, nor Matt liked it. "I don't think it's very good", was his judgement on one of the characters that would make him a superstar."