Absolutely great - and underrated here
This was really much better than average British comedy, and not only British.
Combining depth with humor is always best thing in movies. Most of actors did great performance, especially 3 kids. I was not impressed with first listed actor - Rosamund Pike-s performance, just to note, considering that she is Oscar nominee currently (with minimal chances, I guess). But fact that she accepted role in this movie after many Hollywood films is nice.
Low rating here is not surprise. But I'm sure, that this little gem will make some people, families to think about their life(style) and going in right direction - true value :-)