(oh and, whilst septic (tank rhymes with yank) isn't a very nice term, it's only ever used affectionately in the same way Brits will call their best mates tossers etc. If people want to be nasty, they don't bother with rhyming slang -"Bloody yanks" works just fine. But it's still probably something I should have used without more
-type things. or maybe at all)