Perhaps it slipped your memory, but there are lots of very desirable bikes from the UK, I namewww.in no particular order. Horace Bates, Claud Butler, Hetchins, Holdsworth, Hobbs of Barbican, Dawes, Raleigh,Mercian,Gillot,Paris plus many more.
May I suggest you look at www.classicrendezvous.com on this site you will find only vintage marques from around the world dating from 1900-1984.

Hope this helps