That's unusual RK
Most frame builders would have a "track" version of their signature road frame.......
I did research this frame quite thoroughly after I acquired it (from a member of the Davey family - look up Charles Davey, see link below, he's v.interesting and competed in the 1912 Olympic road race in Sweden!).
After speaking in some detail to the Allin staff member previously mentioned, I'm confident in my knowledge about the frame and the maker over a 20+ year period.
We (the old-timer contacts mentioned) think the frame may be the only one in existence. My intention is to restore (I have transfers and an NoS headbadge) it as it has some damage that should be repaired and the vivid colour has faded. The unfaded colour under the BB makes your eyes bleed!
I also have the full spec that Keith Butler would have used BITD. Keith is still around but I have been given the impression he's not a friendly chap!
Thanks for the interest.
Co-founder of a V-CC section, member South Eastern Road Club and owner of - 2005 Bianchi Reparto Corse (modern), 1985 Raleigh SBDU Pro Super, 1984 Raleigh LU Corsa, 1980 Allin Stan Butler Special, 1978 Ron Cooper, 1975 Bill Philbrook tourer, 2 x very early Roberts (mid/late 1960s), 1966 Raleigh Superbe Roadster, 1964 Allin Stan Butler Special Belgique, 1951 Hobbs of Barbican S/C, 1950 Hobbs of Barbican S/C, 1947 Hetchins Super Special, 1908 Centaur Featherweight. 1988 Specialized Stumpjumper.