I ‘ve had pretty poor service overall from Kwikfit except in Aberdeen, where they repaired two punctures when I turned up 5 mins before closing time (having used the gunge & compressor in the tyres to get me there). My nearest branch is hopeless, they broke my security wheelnut during a tyre replacement & just told me to take it to the dealers, not their problem…
I now use Tyre City (the name Joss was looking for I think), owned by the same company, but the local one is very good – I’d assume each branch would have to be judged on its own merits.
In life, it's not who you know that's important, it's how your wife found out.