Hetchin's as already stated did use Chater and Brampton lug blanks and worked them into their own patterns. I was told by Alf himself in the early 1960's on my many visits to the Seven Sister's shop that they used Vaughan lugs as well. Vaughan lugs were made by Charles Vaughan of Birmingham and they would cast lugs to order. The firm later became Dixon-Vaughan. I was also shown pressed steel cut-outs (extensions,tangs, bilams etc.) of the various ornate lugs and fork crowns. Can also remember seeing bare Magnum Opus lugs with the extensions already in place. These appeared to be spot welded on but I am no engineer just a cyclist's. Sure he told me that they chromed up better if the extensions were already in place before brazing. No visible join to mar the plating. Must have been a hell of a lot cheaper to have these extensions stamped out as opposed to hand cutting and filing. There was a wonderful glass display cabinet in this shop during that period containing there many different lug patterns. Can't recollect it being in the Southend shop after the move.
Thats all for now. Keep those wheels spinning, in your memories if not still on the road. Be lucky Mick Butler Huntingdon UK.