Mick are you sure that Chater and Constrictor used badged up BSA hubs? I am very doubtful of this. Lets not forget rivetted flange Airlites, Solites, Brampton's C5 and C28, Tabucchi, Blumfield, Simplex "Octagonal" and of course...Campagnolo. All this from a copy of Holdsworth's Cycling Aids 1936. Claud Butlers had their own brand hubs which were possibly BSA, not sure. Mark Stevens, wet and windy in Dingwall, the weather that is. Scotland.
..may the sun and the wind be at your back...