In the "build yer own" posse, I have a Dawes Galaxy from around 1977 that is going to be my "Clubman". I ride tall frames 62cm-65cm road frames, XL in modern frames. A 23" Raleigh is okay so a 25.5" Dawes has to be better.
There are a lot of frames from the 60's and 70's that would make ideal 3 speed conversions. FWIW my Clubman is actually going to be a 4 speed or 5 speed depending on which hub I decide to lace up.
Aaron