You don’t usually see errors with proof coins, but there are exceptions. One involved 1975 dime proof sets, which that lacked an “S” mintmark (from the San Francisco Mint).

All 2p coins printed between 1971 and 1981 had "new pence" printed on them - after that, the writing changed to "two pence". But in 1983, a small number of coins were mistakenly struck with the ...

The edge inscription on this coin should read "what a piece of work is a man", but some coins have the words "for King and country" that was used for a different £2 coin. Fine one, and it could ...

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But from one day to the next interest can change, so there's no hard and fast guarantee you'll be minted, snapping a rare one up. In any other circumstance a 50p is worth exactly that - 50p.