@gjo thanks for the info on Anthony Smith.
@DerekB Thanks for the additional names. I think the criteria for now is whether they learned or have taught classical guitar-making in the UK for any period of time. I'll look up all the names you mention and add them to the list if it looks like this is the case.
Edit: On second thought, I think this is first and foremost a list of classical guitar makers living in the UK, regardless of where they learned the craft. So, someone like Jose Marques, who learned in Portugal and now makes guitars in Suffolk, should be included. Likewise, Stephen Hill seems to have learned the craft in Spain but has taught periodically in Sussex, so he should go on the list. I'm not too concerned about who is on the list or not, it's the relationships between luthiers, the transmission of knowledge and skills, that is of primary interest to me.
Happy to take advice on this!