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@RgrahamH
I've just checked my derailleur and it is marked "5 vit Chaine 2.38". So I'm guessing that means it is 5 speed and 3/32 chain. My rear dropouts are 115mm but I might be able squeeze a 120mm axle in at a stretch. So 4 or 5 speed freewheel required. I'm quite pleased with that!