It could be a genuine mistake, but changing pads should be standard procedure for a place like that. Do you know what pads they use?
There are a couple of Jap specialists near me in Camberley that i know of, one in fleet (i forget the name) and one in Normandy, Eurospec, which i have used before for a clutch change on a previous Zed. If you ever need an parts, speak to the traders on hear ZMANALEX for example has pretty much everything. CS also sell a lot of parts, i recently bought my discs, pads and brake lines all round from them. For all your exhaust needs, speak to TARMAC.