I think you need to sit him down and tell him that that is just not fair.
The other alternative is: is there anyone else in your running club that has childcare issues with races? Could you make an arrangement with them to take turns and look after each others' kids at the staft/finish lines? (or at home).
Hi mathschick, thanks for your reply. I did try to discuss things with him but he just brushes it off as he made is mind up and in his opinion there is nothing to talk about. In his opinion if our son is old enough to make his way to school by bus 10miles away (albeit once a week) he is old enough to wait at the end of the race.
Im new to my club and most of them are man (where the wife doesnt run) or single younger ladies who take part in all races. Was not considering begging for childcare when I have a husband and I believe that we are a team and we should support each other.
Bloody hell!! Just tell him kids are a shared responsibility. Why did he have kids if he didn't want to take a turn every now and again? I must admit it was never a problem in our household where we all are runners including the kids (grown up now and left home). There are loads of subtle underhand ways I can think of to make his life hell..... but you too are a woman and we are a resourceful bunch! Joking apart, I feel for you SC - the simple answer is to enter different events? I am still seething for you over the fact that he actually stopped running and only started again when you did... can you not start making yourself scarce on his running club nights....
Hi Tigerlily,
the kids have done a couple of kids races prior to the larger event, yes, when they are older they can either participate or be left alone without any issues.
Participate a different events? Yes if I take up javelin or windsurfing
, he has
intention to participate in every local race . He is also under the impression that he is under obligation to represent his Club at every event! 
For example I did a 6m xc race soon after I started training and quite enjoyed it. Talking to my hubby about it, he said that he didnt have any interest at all in XC running. He didnt like the uneven surface, he said it causes injuries and it was not fun. I could not persuade him, UNTIL he joined his Club, they told him "why dont you join us on this /that xc race" and next thing he bought himself a pair of xc trainers (which I said try it before you commit to spending £60 odd for a race you might not enjoy?) and now he does all the XC he can, to represent his Club (according to his work shifts).
So essentially we want to enter the same sort of events (10m / 10k) for now then in a few months time I want to attempt my first ever 1/2 marathon but he is taking all the fun away. I feel like Im competing against him and Im not good enough, a nuisance, a spoil sport, the newby trying to take all the fun away from him.
PS dont worry I wont try the 'jelousy' technique. It's just not me. 
Edited: 15/01/2012 at 17:29