Can you help to identify these frames, bikes or parts?

I posted these pics on the Classic Rendezvous forum - those chaps seriously know their onions - I was advised that if there are cable stops for rear mech only it must be a custom UK time trial frame - especially with all that drilium. The lug filing shows it to be the work of a high end builder, and the 3-digit serial makes it likely to be Ron Cooper - I called Ron this afternoon and fired over some photos so we shall see how things pan out on that...

But no info on the lugs?