G'day Chris
as I have alluded to on here, I have a couple of 70's Mazdas, which mostly came in the 4x110 stud pattern. This was used pretty much by Mazda and no one else, so what a lot of Aussies do is have the hubs changed to 4x114.3 so that we can use Datsun wheels (some people mash 4x108 Ford Escort wheels on but you have to bend the wheel studs slightly and although a great mate of mine in Wales does it and hasn't had an issue, I have seen some sad looking Mazdas with damage and wheels missing after the studs have broken).
I know of people here in my home city that can whip up some autocad or similar drawings for hubs, or if I pull my finger out and go rip off the hubs from the Rover in the wrecking yard that Al and I know of, I could get the stud pattern changed on the factory ones.
I'm interested in what people think is a better stud pattern to use. If we went 5x114.3, then that's Australian Ford, Nissan and a few others. 5x120.7 (I think?) is Jaguar and Chevrolet.
This is mostly why when I do a search, I've been searching for "15x6" +40 in google and seeing what comes up and what is popular. For you UK guys, I think some BBS wheels would do the trick nicely.