My ex and I broke up almost a year ago and we have a 2.5 year old boy. I have tried to keep everything friendly and haven't gone through official channels to organise contact or child support which has worked for the most part so far. We agreed our son would live with me and he has him Friday night to Sunday lunch every other weekend and he gives me £445 a month in child support. I've just been away with a friend for four nights in a trip we planned three years ago and now I'm back my ex is saying he can give me less (he's suggested £300) because he's having him more than 52 nights in the year because I've been away. Would this hold up with child maintenance service seeing as it was a one off trip which won't be repeated?