Thanks for the replies so far, folks. I should have been a bit more specific.

I'm looking for frame sets that have nearly identical features to the Centurion so that I can recycle as many components as possible - the bike was pristine and I want to retain as much of it as possible. I am not interested in purchasing a complete bike because I'm currently attempting to downsize the number of components I have floating around the shop, rather than the opposite!

And currently this is just for research's sake - hence the interest in discovering possible replacement frames. My funds are currently tied up in another project so unless if the perfect frame at the perfect price springs out of a hole in the ground, I don't plan to be making this purchase soon. Cheers!

(p.s. I'm also a sucker for Reynolds 531)