@izzythepush,
Izzy no worries, mate. I've been to your delightful country and am a fan of Brit comedy. I'm well aware of your foul mouths.
The suggestion that arse derives from Anglo-Saxon is probably true, I never thought about it, just anthropomorphized it I guess. All my immediate family, aunts, uncles were from across the pond. I never heard them say arse even once, but then they weren't gentrified... lol
Growing up, it was always the more prissy people on tv shows saying arse. Or older period pieces, Canadian stuff like Ann of Green Gables and what not. Strong protestant types with a lot of stiff upper lips...