I'm a bit puzzled by the 'diddled' though. Usually means cheated or conned out of something. It's not some attempt at rhyming slang for urinated is it? (diddled=piddled=urinated into). Bevvy is an alocoholic drink, usually a beer (ale, lager, bitter, perhaps also cider) rather than a short.

"for your flats" is a bit confusing too. Another attempt at rhyming slang?