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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.
Not sure how this would work. You'd be crystallising the gain when you place the wager and CGT would become due at that point.