Correction: 26 x 1-1/4" (32 x 597) wanted.
It's an old ladies BSA frame from ( I believe ) 1940s or 50s. Used by a district nurse for a number of years (so family legend has it)
Finally scrubbed enough of the shoot off the tyres to find its not 26 x 1-3/8 at all, it's 26 x 1-1/4 (32 x 597) which is even more rare, and a little sportier than might have been expected for a district nurse !
Also rear has a flip-flop hub, I'm told a 3-speed Sturmey would have been more in keeping...
Those wheels may have not be originals though - may have been fitted when it last had a major overhaul in 1978. The guy who worked on it at that time was a bit of character: Enlisted in 1914 as an underage Private - demobbed as a Captain with an MC. Wouldnt surprise me if he had some "sporty" wheels lying around...
Anyway, working on it now for his grandaughter, who last used it when she was at uni in early 80s. She doesnt want anything "slower" on it than it had back then.