When have trouble accessing  page, just keep peeling off the trailing
part of the directory till you find something. E.g.

http://www.geog.leeds.ac.uk/people/a.turner/

Then you can look around for conventional links, or look for an email
address to ask the guy where the page went.

If that fails, try googling the guy's name.

Links to university sites go stale very quickly.  Often the material
goes with the student to some new website.