Hi Gregory! What a name for a bicycle too - and it looks fantastic. The commitment on your part to the originality of the Carlton (and the other machines in your care!) is impressive. I am inspired to continue searching for GB Coureur brakes and GB handlebar for my Sun Wasp to go with the '50s Spearpoint stem I managed to hunt down. Really what I'd like to do is send the frame to Mercian for a full restore and enamel job + period transfers. What would be a period appropriate derailleur alternative be for the Simplex? Campagnolo Grand Sport?