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Re frame sizes and bike fitting ... thanks @clubman. Agree with all that. The bike fit I had done early on when I picked up cycling again. I used that as a template for other builds but I've since ridden a lot and think that's why I got to wanting a longer reach / flatter position. However I have not ridden much in the last year or so (spending several months of lockdown without a bike or just riding fixed around a shorter circuit), I've even had to resort to running grimace
[The builds I've got going on now are varying sizes with stems of different reaches available so I'm going to play around and see what's comfortable.]
veloham
I was 5'10", but I've probably shrunk a bit - this is caused by compression of the spinal discs, but I guess my legs are the same as ever.
Yes, I measure frames from the centre of the BB to the top of the seat tube, but in the case of a lugless frame with a projection above the seat tube for the clamp, I would measure to the level of the top of the top tube. It's worth remembering that virtually all old British built frames will have been built to a round number of inches or half inches - it would be rare to find one that was say, 22 and three quarter inches, for example.
Bike fitting does depend on the opinion of the person doing the fitting. I had one done before deciding on the last frame I had built, but the result was a bit disappointing. The 'expert' had decided that I was a fast pedaller and recommended a 75 degree seat tube - I never did a decent ride on that frame. Of course it might have been due to my own failing powers.
In the end you just have to find what is most comfortable (of efficient ) for you at whatever purpose you're using the bike. Alternatively if you want to look in period you may well have to put up with some discomfort and inefficiency.