http://vintageradio.me.uk

A superb site full of articles from vintage radio magazines, galleries of valve and transistor radios, manufacturers index and loads more.

http://www.eddystoneusergroup.org.uk

A mine of information on vintage Eddystone receivers, catalogue downloads, servicing information and a huge gallery.

http://www.crystal-sets.com

Ian Sanders' website introduces what is probably the most authorative guide to British crystal sets - Tickling The Crystal, a four volume set (each volume available separately) tracing the history of radio from the very earliest days with full colour photos of more crystal sets than you could imagine!