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Ah, I was thinking he meant using the BTC to place the bet.
This is just spread betting. It's legally tax free but you can't offset losses so you need to be confident of something increasing beyond the offered spread.
There are plenty that offer this for shares, markets, etc but I don't know of any that do it for crypto.
If you could bet on whether the price will increase or decrease over some time period, I think you could effectively create a price tracker out of a series of bets which could end up being CGT-free. But that seems incredibly stupid and borderline fraudulent. Fun idea though.