Thanks for the responses and sorry, I should have said where I'm based!
Thank you for the suggestions Paul and Andrew, but Birkenhead and Devon are both a fair journey from London
I've heard of Brook guitars, though.
I had not thought of Dave King, bobster. Good call. I will more than likely go to him, and I will bump this thread with the result of the neck reset in due course (may not be for some time, but it's on the cards).