Originally Posted by Steve - UK
If you are determined to stick with Michelins then you are going to nhave to pay the price, but there are loads of equaly good tyres around for half the price. ATS and Kwik fit are a rip off and rely on folks who dont want to shop around and can aford there prices. Also, they know nothing about fitting tyres to high performance cars. Check out
www.blackcircles.com, or,
www.mytyres.com, they deliver to your door and you can arrange fitting your self or choose form their appointed fitters and do it all on line.
Much much cheaper, I saved £150 with my last set of Conti Contact Sport 3's, which are also fitted as standard equipment.
Good advice Steve 
The two links you provided are exactly the links I use. As far as I am aware mytyres used to deliver tyres to a location of your choice so you don't have to carry them around or be in when they are delivered, could be the tyre fitting garage for instance.
What I always do is ring up Gordens tyres in Wakefield, tell them the price on mytyres and to date they have always matched this price. Of course fitting and balancing is extra at around £10 to £12 but you would have to pay this anyway, this method has always worked for me.
You just need to ring various tyre-fitting dealers until a one pops up and matches your lowest price so shop around until you find a good one.
Alan.