The Sandpit is run by Cerberus too, unless there's 3 sites with that name. Personally I would never go to one of their sites again after the insanely disastrous experience I had from going to The Works for the first time at some point last year. Worst run site I think I've ever been to, and their interest in safety was laughable, never seen so many people cheat, and so much conflicting info being given out by different marshals in all my time airsofting. There's even a public footpath running through the middle of the site, that had dog walkers come along it about 7 times throughout the day (yes, that's not even an exaggeration) and the marshals can't even decide on whether or not it's in play... How no random members of the public have been shot yet is absolutely beyond me. I can't actually believe they're still running... But they do include pie in the price, so they do have at least one redeeming feature.
I'll let you make up your own mind though. Go and try it by all means, always interested to hear what other people think of them.
But anyway, Brit Tac run games at Bawtry Paintball around the Doncaster area, and there's Tac House: Spartan in Chesterfield too.
If you've played at Skirmish's Wentworth CQB site then we've probably met lol, I'm sure your name rings a bell from Facebook.