Did you know it is illegal to pay any amount over 20 pence in copper coins, any supplier or vendor is within their rights to refuse accept any payment with copper coins above this amount. Recently a woman was not allowed to ride a bus because she wanted to pay the 25p fare using copper coins. The police was called and had to give the young lady 30p in silver coins before she was allowed to travel on the bus.
Also bare in mind it is illegal to pay for any bill exceeding £5 with 5 and 10 pence coins; ditto for a £10 sum with 20 and 50 pence pieces.
So don't get caught out have the right coinage