I used to fly at PFT at Kidlington, who have an ancient FRASCA sim which I suspect was once CAA approved, though not I think now. Certainly when I did my IMC we used it for training, but it didn't count as part of the 15 hours. It has a plotter which will draw a map of your route, and instructor controls for failing instruments &c.
That was £30/hr at the time (2003), plus instructor fee if applicable - or free for students currently doing an IMC course. As a result of the latter, I spent quite a bit of time on it and it undoubtedly contributed to my doing the IMC in minimum hours.
Tim