try admiral, sky insurance and chriss knott (last two are traders on here I believe) sorry to hear your problem buddy but esure arent the greatest with performance cars in the first place but still harsh they cancelled your policy (however would expect nothing less from insurance in general). Im with Admiral and added front bumper and rear spoiler and few other bits and as it was all cosmetic they added £30 to premium and said I would only get oem replacement if got in accident. Generally dont change anything without checking with your insurance first, hope you get good quote elsewhere