I don't think that's unreasonable at all. You have an informal business arrangement, if he wants you to continue, then it's time to put it on a more formal footing. You make the introductions, he gives you a percentage of his fee. "Sticking to the usual" sounds like an easy way out for him, but he can put your fee down as a legitimate business expense on his tax return. Treats are not pay - but do bear in mind that if you have a business arrangement, the income you make from it will have to be declared yourself to the taxman, whereas at the moment, your gifts etc are probably not.