Basically I need a word that my character could use to refer to the thugs that beat up his friend. Something roughly equivalent to today's 'bastard' or 'git'. He's from a well-off background, public school educated (as in an Eton-type place), currently at University (Cambridge, to be specific). Mainly, I've found very American words that I can't imagine him using, he being painfully British, of the 'I say, let's jolly well play cricket!' type.
I've seen PG Wodehouse use 'son of unmarried parents', but that sounds far too much like a comic euphemism, though it does suggest that 'bastard' was being used as an insult.
Research: I've looked in the archives here and googled various combinations of 'Edwardian slang' , 'Jazz Age insults', 'public school [and Eton] insults', but no banana.
I'd love a good list of British Edwardian (or thereabouts) slang, so if anyone knows any ...