Messaged the guy... This Dolan is 53cm seat tube (c-t I think) and 55cm top tube c-c. Too big for the rider I'm shopping for, but it might help someone. 20 hours left.
Seller also has an identically sized red road bike (53/55), half decent spec, and it's currently at £99 no bids.
Dolan with spinergy wheels - worth it for the wheels?!
https://www.ebay.co.uk/itm/Blue-Tony-Dolan-Road-Bike-/313786533687?mkcid=16&mkevt=1&_trksid=p2349624.m46890.l49286&mkrid=710-127635-2958-0