As with anything there'll be good and bad with both. They will be some good back street or lets say independent traders, but it doesn't mean they are all the same, the issue is finding a good one and sticking to it, just because an independent garage is cheap it doesn't mean the will be rubbish. Big names are just as likely to provide poor service, it depends on the employee and how their manager deals with them if they can't be bothered to do things correctly.
I didn't have a puncture after all, the nail hadn't gone far enough in, so it didn't even cost me the £10 to have it repaired.
Good to find out whether the Wanli tyres are good for the price or not. I doubt they are much better than my Rotalla's as it's in the wet when mine can be dodgy, so I have to go easy when cornering in the wet. I've read some good stuff on here about the Toyo (think that's right), and wondered if the Wanli were as good, or if it was just that people who'd had problems hadn't commented.