@argyl53 has summed it up nicely. I don’t think anything else really needs saying.
If you stick to the reputable, UK casinos, you shouldn’t face these sort of issues.
Also, I like that this topic is sprouting up the debate around randomness. It’s one of my favourite topics in life. There are very few (if, arguably, any) things that are truly random. We consider things like a dice roll to be “random”, but it’s not even close. We just assign the term random to things where our brains cannot feasibly process the variables involved.
Quantum mechanics has an interesting take on this topic if anyone is interested in reading further into it all.