I have to use my local Kwik Fit for tyres for the leased company van I drive for work. Luckily, they're not a bad bunch.
I got a puncture a while back. I discovered that my neighbour's builder was putting a skip on my driveway for a few hours whilst I was out at work without my permission. Unfortunately, his sweeping up skills matched his throwing things on target into the skip skills so I ended up with a piece of radiator pipe in my tyre after I pulled up on the drive in the dark when I got home. Went out in the morning to discover a big fat flat. After putting the spare on, sweeping up all the cr*p and taking it round to the neighbours I popped down to Kwik Fit for a new tyre. Two days later, the same thing happened. Got a screw with a bit of kitchen cupboard attached to it through the tread. Another wheel change, another trip to the neighbours and another trip to Kwik Fit saw them repair the puncture within 10 minutes and for free so can't fault them there.
That was Kwik Fit in Shirley, West Midlands. Went to Kwik Fit in Banbury once and the service there was the polar opposite. Absolutely chuffing useless!