If you get Halfords to do it for you and you use the paint and get a good match you`ll be very lucky.I ended up spraying my bellypan black as the only way to get a good match is to buy the base paint and top coat together from a good supplier such as RS Bikepaint and that will cost you nearly £60 for a few spraycans. They also do a touchup for stone chips and stuff.
Maybe I should have bought a black fazer and not a red one!