I don't think it's emulated unfortunately, or even if any ROMs are available. I'll have to see if I ever saved off a pic somewhere. I'm pretty sure we're thinking of the same game. It was in the same cabinet as Psycho Cash Beast, King Kebab and so on. The frames were purple, big circular board, Lady in the Lake mentioned somewhere, I think you had to light the word Spellbound or Excalibur to start the feature perhaps. Would probably have been 20p play £10 cash originally, but the last one I saw was 10p play £4 jackpot or something. Made by BWB, with the BWB-style reel symbols of the time. I wish I could remember more, but it was a pretty forgettable game considering some of the other stuff around at the time. It's possible there were checkpoints around the board where you had to do a YES/NO skillstop to carry on. Someone else must remember it...
Definitely sounds the same one I remember. I only remember it being in one arcade and 10p/£4 sounds about right. I just remember it being a machine that gave a long game on a modest amount and give a decent chance of been ahead at the end, at least at that stake. There are very few machines I liked that can't be played on emu any more, this is perhaps the last one for me.