Do the pads and discs yourself, it's really simple to do. If you don't trust yourself, buy the parts online (Brakes4u is good) and get a good local mechanic to fit. Just one on the calipers that someone has already mentioned. The rear calipers are very prone to sticking, so after a long run, feel the alloy on each side. They should be cool, as the rear brakes do very little work. If one or both feel hot, then the caliper may be sticking. If this is the case, get a mechanic to give them a good clean up and relube the slider pins. Excessive constant heat destroys calipers. I left mine for too long in this state and ended up paying £350 for both rear calipers.