I've got the ultimate solution to the problem of being given the wrong change ... From now on, I will carry only 1p pieces and will count out the exact number required to pay the bill!
Only if you're spending 20 pence, or less
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Coinage Act 1971
2 Legal tender.
(1) Gold coins shall be legal tender for payment of any amount, but shall not be legal tender if their weight has become less than that specified in Schedule 1 to this Act, or in the proclamation under which they are made, as the least current weight.
(1A) Subject to any provision made by proclamation under section 3 of this Act, coins of cupro-nickel, silver or bronze shall be legal tender as follows—
(a) coins of cupro-nickel or silver of denominations of more than 10 pence, for payment of any amount not exceeding £10;
(b) coins of cupro-nickel or silver of denominations of not more than 10 pence, for payment of any amount not exceeding £5;
(c) coins of bronze, for payment of any amount not exceeding 20 pence.