Thanks @CharlotteIG ! That's reassuring.
I'm sure IG have already seen this, but someone on twitter linked to this Policy Statement from the FCA, saying that it will come into effect on 6th January:
https://www.fca.org.uk/publication/policy/ps20-10.pdf
"Prohibiting the sale to retail clients of investment products that reference cryptoassets"
Incidentally the trader on twitter who linked to that, was commenting on the recent drop in bitcoin and said "Crypto exchanges started announcing liquidation of UK customer accounts ..not surprising BTC sold off."
Best wishes,