Going off on one - we were working along side two gas fitters t'uther day who cheerfully set about replacing a gas boiler for the customer, at the customers instruction. They were thorough and informed the customer about issues with condensate, existing rads being mucky, magna clean stuff, existing pump dodgy - all above board.
The gaffer of the two received a call and looked at the screen before answering and said.."such and such must be out of prison.." before answering and having a conversation with said prisoners wife. The upshot is that she wanted a hooky invoice off him for a dodgy boiler fitted at her house that was now on the blink. He refused (said he wouldn't risk his licence etc) and said those pesky Gipsies (or words to that effect).
Turns out that the plumber is part of the community but decided to make an honest living for himself. We had an interesting chat about the differing levels of dishonesty amongst the community and he said I trust none of them, but all can be resolved with a punch up.
EDIT: he had some loud music on and I jokingly said I'll boot it over the fence if he doesn't change channel which he did in good humour. That was before I found out he was a scrapper eek!