Try our new info resource - "Aladdin's Cave" (Main menu)Just added a separate link to Ash's Dropbox thread (shortcut)
I have used Heidenau and had no problems with them, they are a German company and probably of higher quality than the other tyres you listed.
Thanks for all the replies and I think I'll go with Heidenau. New tubes and rim tapes as I've no idea who old they are. Well I owned it for the bike for 46 years and don't ever recall replacing them so I think it's about time! Runs well but I do feel a little venerable on a low powered bike now. Anyway added a couple of images of it, might bring back a few memories for the older members.