Well, let's see....
It's got Hugh Laurie in it, so it must be funny, right? And it's about making babies, so it must be very funny, right? And it's written by Ben Elton, so it has to be very, very funny, right? Well, the ingredients may be there but this christmas pudding is a stale pancake. As a brit, may I be honest and say that the term "British comedy" is very much a contradiction in terms these days.
Trouble is, all the 'in crowd' who make films here don't have a shred of genuine humor between them. For 'comedy' read 'stupidity' - so far as these idiots are concerned, they are interchangeable.
Sadly, only americans know how to do humor now. They don't know how to do much else, but they do know humor.