Just thought I would give Alan Marlow's lens cleaning/repair business a bit of a punt as I am extremely happy with what he has done with 2 knackered lenses. My Sony SEL 24-70mm f4's AF packed up a while ago. I stripped the lens down myself, found the problem, but it still didn't work. Sony quoted me £210 just to look at it. Alan Marlow fixed it for £45 and it's as good as new. I also sent him a Minolta 28-135mm f4-4.5 my brother gave me. It's rated as good as Sony's modern zooms and is the perfect range for aerial photography. The one my brother gave me had fungus; Alan cleaned it completely for£35. I did have to chase him up 2 weeks after I sent the lenses, but I then had them both back within 3 days. I will be using the Minolta with an af adapter.
Awesome service and very cheap imo; I highly recommend his service for anyone who hasn't come across him yet. http://www.cam-rep.co.uk/