Sorry, I'm a non-starter after all. On the ride back from Arkaroola for some reason the rear brake dragged just out of Mallala. When I stopped and checked the disk was sizzling. I was able to back off the pads and rode home studiously avoiding using the rear brake. I'd hoped to remove the caliper this week and check things out and deglaze or replace the pads. I haven't been able to remove the locating pin to date so I best not go on longer rides until I get it sorted out. Enjoy lunch.
Cheers ... Mark