You've surely wasted more than £20 of your time going to and leaving two places and you still don't have your tyres fitted?
I'd focus on finding somewhere good and that will take care of your car and/or wheels. You won't care about £20 once a cheap place has damaged a rim, or broken a locking wheel nut with an impact gun.
How much did you pay for the Tyre's ?I've been to a couple places today to get a pair of tyres I bought online fitted, one local fitter wanted £40 and ATS Euromaster wanted £44.
I can remember only a few years ago paying £10 a corner?
What's everybody else's experiences?