My first year of ownership of the R1100RS comes to an end, and I've got the old machine serviced again by George in Queensferry. Turned out my sticky brake caliper was nothing of the sort, and was actually a sticky brake lever pivot. The way to check? Spin the wheel and move the lever!
Unfortunately the allen bolt head has been mangled in a previous attempt, and the casting can be at risk if you give the bolt removal a good shot, so the miracle WD40 has done the job, and I have my instructions for where to spray a liberal supply to keep it unstuck.