tman: Thanks, I'll try Bull on Monday. You're right, their website is rubbish!
larry818: Thanks, that looks like the stuff but with too many conductors. At this point, I'll likely order something like that and strip it down and live with the colours being wrong (because proper 2, 3 and 4 way ribbon has different colours next to each other - don't know about 6 way). They do samples, too.
shonky: Thanks, that looks like the stuff, but with non-standard sized cores. That'll do me. Maplin only does ribbon cable in super-light-duty guage - the stuff one would use for IDE drives, VFD connectors and the like.
I am really surprised at how difficult it has been to find this cable. I see it used everywhere - in my computer, in my satelite receiver, my VCR. So a big thanks to everyone that replied and gave me some leads. Hopefully I'll be able to get my hands on some soon...