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definately not L&M they are well overpriced . The best and cheapest place is http://www.powerfiat.co.uk i think it is £400 full inclusive of all tensioners and belts, and i have heard nothing but praise for the quality of work. They will have it done for you within the day aswell.
But yeah have a look on the above form, the other place to have a look at is tourqeitalia.