This frame, S1218 was kicking around years ago, owned then by Brian Austin from Buxton. I always thought the frame stamping looked,” not quite right”. The original bike bearing this number was registered as 165 MPE. Ex works 14/12/1959. The engine was DMS 1215,(as stated). It looks like this bike was broken up and sold as parts. The photos of the stuff now for sale, shows two of the fork legs (with the axel holes not in line) are Panther or Velocette. The rusty chain guard is not Brum, the top one in the photo is. The rest is all usefull good stuff!