I'm sorry maybe I did not understand the question. What do you mean by a "UK sports betting site"?
Don't you just want a site that accepts betting on UK sports, like william hill, betfair, titanbet, etc.
Titanbet even accepts deposits with btc (and you can ofc deposit via neteller, that also accepts deposits with btc on all the others).
Or you want a site that lets you place your bets in btc, and not just let you deposit and convert to another currency?
I am looking for a site that allows betting on sports in particular horse racing which I can access in the UK without having to go down any VPN route, somewhere that accepts Bitcoin and pays out in Bitcoin, I tried Directbet but they are not available in the UK.
Cheers