Mark, I don't know for sure but I assume it was like this. Accles & Pollock and Reynolds (they were the same firm after a certain date) both made taper tubes. Think Ewing and Deans (which was Granby) were the first to use this tubing or really sold and marketed taper frames, closely followed by Selbachs and Buckley Brothers and other smaller outfits. Browns being a massive wholesaler just advertised the tubing as Granby taper tubes because everyone associated this builder with taper tube frames although a whole host of other makers made taper tubes. Taper tubes unlike other specialist items such as diadrant forks and curly stays were available to all builders. Think this is correct although I am not positive but if it was listed in Browns it was available to all. Will keep my eyes skinned for a Cyclo but if I find one I would rather swap it. Take care Mick.
Thats all for now. Keep those wheels spinning, in your memories if not still on the road. Be lucky Mick Butler Huntingdon UK.