Chi,
Do a Google search for RMI or SMMT.
They're the 'bodies' that cover most of the garages in the UK
done a quick search for you ut you may find more help with a more detailed sift thru the SMMT site
http://www.smmt.co.uk/consumeraffair...N=57734660#254 In my view they're liable but as already stated you need a consumer specialised brief to look at it for you or go to the Citizens Advice as that free.