“Knock Somebody up in the morning” - I get that. Knocking to wake them up.
“Taking the mick”... I’d think that meant “fighting with an Irishman”...
“What have you been up to?” British Bobbies asking that question... I can see that.
“The LOO?” What in hell....?!?!? Haha!!
Yeah... the "loo"... no idea brother. :-) I'm not even sure they know. It's probably either due to some French or Flemish root word.
Oh... another word they used to laugh at us for was "trash can". They'd laugh pretty good over that! It's not a "trash can"... it's a "dust bin" :-)