When I removed the nearside rear wheel, I could see that the handbrake lever wasn't returning fully.
It wasn't a lot, but enough to prevent the pads from releasing fully from the disc. Hence the nasty burny smell!
I realised that I could carry out most of
this
without taking the calliper off the car.
I dismantled the handbrake lever and disconnected the cable as in the how-to. I then unbolted the calliper from the carrier, so that it was only attached by the brake hose.
I noticed that the rear pad was also binding in the carrier. I filed the edges of both pads until they moved freely in the carrier.
I sprayed white lithium grease passed the seal and manipulated the lever until it became free again.
I cleaned up any overspray, and then rebuilt the lever mechanism. Reconnected the cable and refitted the calliper to the carrier.
Job done, Road tested the car and brakes/handbrake working well and no burning smell!