I wouldnt go near places like KF unless it was a total emergency. Maybe Im being unfair here, but my experience has always been theyre out to make as much money from you as they can.
I went in to get a tyre replaced and was told when I went back 'While the car was on the ramps we noticed your exhaust is falling apart' Firstly now Im no mechanic but I DO know my car doesnt need to be on a ramp to get a tyre changed and secondly there was nothing wrong with my exhaust. It was still on the car when I traded it in some 18 months later.
Ive gone to them with punctures to be told my tyre is knackered and needs replaced, only for the wee garage round the corner to repair it at a cost of £3.
Personally Id shop around, ask friends/colleagues to recommend a garage they go to. One who wont rip you off and will only do work to your car thats totally necessary