I know croups who are convinced they can spin numbers, and not lost a bet with them yet

. There are ways to win regularly, but usually involve loaded dice, teams or bent dealers or even all three.
You know who Wong is right? Lot's of very intelligent people didn't believe him so they set up a bet for $20K or so IIRC. They got the maths guys to work out the bet so it was statistically significant to n standard deviations so that there was .000x% chance or something of it being a random event, I don't even understand how to play the game let alone how they worked it all out. Anyway Stanford won the bet. There are thousands of posts on BJ21 about it. Half of them at least from people who think it's a load of BS.
Personally I think it's a lot easier to read a couple of books about poker and make a bit of money that way but there are people making money everyday in casinos in the US from games which are supposedly impossible for people to make money at long term.
Have you read "Casino Game Protection" by Steve Forte or "Beyond Counting" by James Grosjean? Do people who work in casinos in the UK have to learn about advantage play and all the sneaky ways there are to cheat? Or maybe the average UK punter doesn't even know blackjack basic stategy so maybe there's no need? I've written all this and I'm thinking now that it's likely that you have forgotten far more than I'll ever know about this sort of stuff. Genuinely interested to know how clued up Casinos are about this sort of thing.