How many different currencies are used in the UK?
One...pound sterling...unless you mean what are the different
coins etc, in that case -
Coins: 1 pence, 5 pence, 10 pence, 20 pence, 50 pence, 1 pound,
2 pounds
Notes: 5 pounds, 10 pounds, 20 pounds, and occasionally, 50
pounds.