he lets other people catch him but not me! i dont ride him atm because we havent a saddle that fits xxx
What breed is he and what's his personality like? Take a real good look at HOW other people are able to catch him - if he's sensitive he might be easily affected by your body language and the way you hold yourself x
Establish why he's being tricky and go from there. Could be that he's new and cautious of you, could be he's not accustomed to your style of turn out and loving it... Have you ridden him every time he comes in? Is his stable or where he goes when he comes in small/dark/in general not very nice? Figure that out and then you should be able to work through it fairly quickly