Unfortunately shops/banks and the like have the right to reject this sort of thing I think but the law might have changed since I last looked.
No, that link outlines what rights you have. They *have* to accept:
£5 (Crown) - for any amount
£2 - for any amount
£1 - for any amount
50p - for any amount not exceeding £10
25p (Crown) - for any amount not exceeding £10
20p - for any amount not exceeding £10
10p - for any amount not exceeding £5
5p - for any amount not exceeding £5
2p - for any amount not exceeding 20p
1p - for any amount not exceeding 20p
If you offer to settle a debt by the above divisions then a court of law would rule that you had offered a reasonable settlement. This law came about because people used to pay with small change for the lulz. An acquaintance of mine did it in the 1980s, he bought a brand new Range Rover with buckets full of £1 coins.
Thanks salty. I know I can settle any debt with the minimum of £1 up to any value but it is only a small debt and I want to just wind the guy up. Could you read my OP and see what you think?