Yes Hoop, spot on... they're Rostyles! Didn't wanna give too much away before I had them fitted but I guess I should have known better than trying to fool the wheel whore! 
Have to say, they've been a bugger to strip with all the nooks and crannies and curves and what not, but nearly there now. Could probably spray them already but want them perfectly smooth! Guy I bought them off had brush painted them with this thick browny/black treacley stuff, completely hid all the detail so a strip was a must!
Frank, thanks for the advice! That's all I've been worried about, whether any extra seating was needed, so looks pretty straight forward now.
Would tapered nuts be what the yanks refer to as "Acorn seat"? Just I'm getting a set of Gorilla lugs and the best match to me seems to be the aforementioned acorns? The uts that came with the wheels (too small) pictured below...
