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@MatMabe
Evening Ben,
I've been doing the detective work...
The seat post is 26.8mm, so by your guide we're likely looking at Columbus Aelle steel.
I can't see any markings on the dropouts, but that's not to say they're not there. The recent powder coat seems to be very thick and may well be covering up the engraving - looking at examples, they look Campag to me, at least, by comparing them next to each other I really can't see any difference, but I have no evidence other than my eyes.
There are no cutouts on the BB, but under the (thick as I say) powdercoat, when shining a light over the surface, I can just about make out an engraving of what is possibly '5000', but I can't be sure. With the powder coat being so new, I can't bring myself to chip it away to reveal anything under the dropouts or the BB... but it might come to that.
The threading, I believe is British - under the top nut it reads '1" 24 TPI ENGLAND' but I know that it's a new headset and as the two can be deemed interchangeable, I guess it could be an Italian thread, but with a British headset?
I don't know if that makes it any clearer whatsoever, but if you have any pointers as to what that might point at or where to look next based on the frame type, to narrow things down any, it would be appreciated.
Thanks again Ben,
Mat.