"So, if 12 shillings made £1, that's a percentage increase of er.....erm...
No, 20 shillings made £1. 12 pennies made one shilling."
Cripes, that's a *classic*, even for me, Nigel! I must be older than I think I am, 'cos I can't even work out how many shillings made £1..Holey Moley! :0) LOL
I used to love the threepenny bits best..
Every Saturday my Dad would take a sixpence out of his top drawer, for pocket money..It went all the way up to half a crown, as I grew older.