I use Anglia clipper services near Glemsford in Suffolk for blade sharpening etc. I live about ten miles away, so easy to just drop in rather than sending, and they do a fantastic job. Not sure on costs now, I haven't been this year yet, lol. They do stuff via post as well. http://www.angliaclipperservices.com/ I think all their prices are normally on website.
Cant remember how much it cost but our local saddlery shop does a seasonal clipper blade sharpening and clipper servicing,they have a bloke come into the shop once a week and you just take your blades down
Extremely efficient service. Cost about £80 to have four large sets of blades sharpened and one set of large clippers serviced (including parts) and recorded delivery!
richard anthony, about 25 for full service and pat test, and around 5.50 sharpening. excelent service and fast turn around. based in Docklow, leaminster, herefordshire, used him for 20 years, a lister dealer but does all makes and models. excellent