Maybe Baby (2001) from Johnny Web (Uncle Scoopy; Greg Wroblewski) and Tuna

This is the story about a writer. He and his wife are obsessed with having a baby, and seem incapable for non-specific reasons. They go through every intrusive medical procedure to attempt a solution.

He also has writer's block.

There's no solution to the baby thing, but there's an obvious solution to the writer's block. "Write what you know".

He writes a comedy about their failure to conceive. In graphic and clinical detail.

Unfortunately he makes certain mistakes, which provoke additional alleged hilarity:

1. He lies to his wife and doesn't tell her that he's writing a movie about her "twat" and its failure to facilitate conception.
2. Lacking the proper female perspective for the 'wife' character, he reads his wife's diaries, and injects her private thoughts into the script. He doesn't tell her this, either.
3. He hires his wife's would-be lover to star in his script, not as the would-be lover, but as the husband!

Hoo-boy, she isn't happy when she finds out.

I like just about everything Ben Elton has ever written (much of the Blackadder series, e.g.), but this didn't seem like his A+ material. While this script isn't the second coming of "Blazing Saddles", it does have some laughs, and a certain feel of reality to it, and you could believe that the script really did come about this way. It works fairly well for a predictable formula comedy. It also has some funny, if equally predictable, supporting performances.

Predictable? Rowan Atkinson in an British comedy? Will wonders never cease?

Indeed, when King John signed the Magna Carta, he had to acknowledge that all Englishmen have certain rights. Among those are the right to see Rowan Atkinson whenever watching any form of entertainment. Although John could not have specifically mentioned Rowan Atkinson some 800 years ago, he did say "that infernal, rubbery-faced Mr Bean fellow", so everyone understood what he meant.