It's funny how history sometimes negates what we believe. We still have the foreign money embedded in our £!
The system of pounds, shillings and pence, otherwise known as £sd or L.s.d. (no, they weren’t tripping – LSD didn’t come about until the mid-20th century), had its origins in ancient Rome, where there was a monetary system consisting of silver denarii and gold solidi. One gold solidus was worth 12 silver denarii, while 240 denarii were minted from one librus, or a pound weight, of silver. The Carolingian monetary reforms of Pepin the Short and his son Charlemagne in the Holy Roman Empire revived elements of this system in western Europe during the 8th century.
So £1 (librus) would be worth about £292 these days, 1d (denarius) about £1.22, and 1s (solidus) £14.50. The latter would be a gold coin with a mass of a third of a gram.