m - your sleuthing is amazing to say the least ............. what is astounding, for me, is to read Bernard Cavelot's comments about W/Fs Registrations ........... "So far I've found eight Whitefriars design registrations in the period 1890 to 1945, none of which I've ever seen marked on their glass." A great shame Bernard didn't list the Reg. Nos. - where he found them I've no idea - did he research at Kew or elsewhere?