Hi guys

Thank you so much for your help, that's been very useful. I've also heard back from the gent selling the wheels and the hub is actually ISO threaded. I've checked my FW and sadly there are no other markings on it. I'll take it to a bike shop in the morning in the hope they can advise what thread it is before I buy the wheels. As you say, I could still buy them all the same and source a replacement FW. You know what it's like though; I'm trying to keep as many original components as possible. I looked into buying some clincher rims and having the wheels rebuilt but I can't afford that sadly. I'll keep you posted.

Thanks again

Adam