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@ewanmac
Hmmm tried this, bought it off another forumger and they don't know. I've also tried working out who actually makes the frame. Since their success in the 80's/90's I think that the Concorde brand has disappeared and that some generic frame manufacturer has taken over the name. Wiggle sell a replica PDM Concorde frame that apparently takes an "headset that run a 41mm outside diameter and a 45degree chamfer", but I cant be sure it is the same frame. I also subsequently notice that the "Kiron Mistral" that wiggle claim as their own proprietary frame looks identical to mine but wiggle haven't got back to me on that.
@MDCC
I don't have a set of Callipers so can't measure (plus the guy in the lbs said this is rarely sufficiently accurate anyway). So... we experimented with all the headsets they had in stock and the best bet was an FSA "Cane Creek standard" set but it was far from hand pressure (more strong mallet pressure), so maybe reaming is the right option - but as you say I don't want to cut too much away from the frame especially as it is slightly "cooling tower shaped". I guess I need another trip to town... what an arse.