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I think the principle you want to be looking at is estoppel.
https://www.investopedia.com/terms/e/estoppel.asp
"Equitable estoppel prevents someone from taking a legal position that is contrary or inconsistent with their previous stance if doing so harms the other party."@Dammit After 10 years, changing the rules and leaving you £265 poorer. That seems to fit with inconsistent and doing harm
user69121
If you've been been doing the same thing for the past ten years and they haven't corrected you then they're going to have a pretty tough time enforcing a change out of the blue. IANAL but I think the principle you want to be looking at is estoppel.