They are running on a B3 license in B3 cabinets. There's a 3-reel black knight (same as the £100 version) at £2 play £500 jackpot, compensated game out now too. Having been taken down many times by the £100 version, I declined to play.
Not seen a 3 reel black knight on £500, but have seen the £200 B4 version. Exactly the same as the cat c.
Yes I've heard about these £200 jackpot repeaters but they are not cat c!
It's been £500 jackpot for nearly 15 years!
They have indeed! I would guess, with the £2 stake cap coming in, an increase in the £500 seems a bit far fetched.