Yippee, this item now sorted!. Just been out on a test drive and the spare rear driver's side caliper that Ian kindly loaned me has fixed this issueCasey wrote: ↑Sat Jul 13, 2019 2:22 pm Progress report:
I then decided to spend a few hours with Aston at Essex Rotary yesterday, going over a number of checks and routine maintenance.......
7. .....spent a lot of time trying to diagnose a squeak/rubbing noise, seemingly from the rear, which only manifests on left hand turns. We were unable to reach a conclusion. Possibly wear on a wheel bearing, but it didn't sound quite like it, possibly a bushing, as they were all looking pretty tired. Anyone else experienced anything like this and any other ideas??

See this related thread:
viewtopic.php?f=19&t=4396