Yep - that's my one. I think I paid about £12k for it! When I sold it for about £37k a couple of years later (after I'd improved it greatly, at quite some expense), it was deemed a lot for a Cup. But Dwayne had it a couple of years and sold it on to Suprano Stu for similar-ish money. Since then it's been advertised for more.
If you really wanted it, you might pay towards £50k. But over that, no thank you. It's an awkward car to drive, with rubbish seats, strange pedal position and poor ground clearance (and let's not mention the build quality, rust, etc). So while it is a fun, rare and quirky car, you have to remember what you can get for the same money.
But hey, how many other other RHD Cups are there for sale? None. So why not ask high and cross your fingers?