I hope I shall be able to go there with him one day.
A trip to Alderly Edge was my 30th birthday present from my parents

(when I was young it was too far - albeit from Somerset rather Salisbury). I ended up spending 11 months living fairly close to it before moving to Canada, and it was a favorite spot for walks.
Alderly Edge itself is actually fairly small and you can happily see all the 'book sites' in an hour or two at most (and that included me nerding out and peering around in great detail). A few, like Golden Stone, need a double take as it's nothing like what I had imagined. We also roved about a bit, looking at other book locations, and that took up the rest of the day. Worth trying to correlate the book maps to the OS maps in advance though!