Try these http://www.hanstons.co.uk/
They are in altrincham, atlantic street
My friend works for them, do an excellent job, they pained my bumper and bonnet before I bought my car.
A few of the uk-mkivs.net boys swear by an advertisers body shop called panel care in Rochdale? Lads called Jake, he's done plenty of build threads on the uk-mkivs site.