The feeling I had was pedal pulsing, due to pad transfer on the face of the discs. This then leave 3 options; replace, skim or use controlled heat to sheer off. I needed to do it as the pads are getting low, I didn't want to throw in new pads and have them tackle an extra job.
Process was 50mph to 30mph lightly X5, 70mph to 40mph medium firm x5, 80mph to 40mph hard x5. Steady drive home for 15mins, when coming to a stand still I was sure not to hold the foot brake.
From what I gather a heat cycle is recommended prior to heavy use, as it leave a nice friction surface for the pads.