in the Uk we only need summer tyres - relative to the US we have no winter!
In the past i've found any tyre fitting centre other than Kwik Fit will oblige. Sometimes if you get lucky you can slip the lad doing it £20 and walk away, just go out of peak times. Kwik fit either rufuse to do it or charge loads.
www.blackcircles.com is also worth a check, and they have a fitted option whereby the garage local to you and selected by you calls when your tyres are in and arranges to fit them. All done and paid for in one transaction, but I've found the fitted price to exceed the mail order price by an unreasonable amount in the past.