I only went back as i do a block of 6 and he is in the middle, it only takes a min to knock. He keeps his gate locked so i would need to knock at any rate.
I know I should have reminded him of the t&c's but never did
He is an old chap who I think will be more of a pain than a payer, I have done his windows about 3 times before he got all 'not today ta' on me.
Anyway, I normally stick to the 3 strikes and your dropped way of thinking.