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http://www.camskill.co.uk/m54b0s16p59611/Yokohama_Tyres_Car_Yokohama_AD08_Advan_Neova_Yokohama_AD_08_-_225_45R17_91W_TL_Fuel_Eff_%3A_F_Wet_Grip%3A_A_NoiseClass%3A_3_Noise%3A_75dB
Camskill have them :D
I know you mentioned that you were looking to get lenses that are for your current body, but i'd definitely consider ones that are more suited for full frame.
The Sigma 10-20mm will only be of use on a crop body like your 50D, an alternative would be the Canon 17-40mm f4L.
The next lens i...
Essential piece of kit really. A lot of people overlook this when it comes to their camera gear.
They transform car photography, shooting in the daytime.
I get my stuff from these http://www.mdpsupplies.co.uk/categories/gloss-sign-vinyl.asp
I'd recommend getting the Polymeric stuff as it conforms well to flat and slightly curved surfaces and is relatively cheap.