I knew that, but what is its relation to a pound.... sort of like if you and I said "two bits", but a lot of folk does not know what that means
1 Quid is slang and = 1 pound and there are 100 pence to the pound.
Decimilisation took place in 1971 prior to that there were 12 pence to a shilling and 20 shillings to the pound.