babbo_umbro
Established member
Sorry for the delay in replying. Firstly, thanks to everyone for the excellent advice and such speedy responses. I ended up taking the rear wheels off and using a little gentle persuasion with a hammer all around the drums. To my amazement, it actually worked, and I was able to get to a garage. The diagnosis was that one of the shoes had "shattered" and was split into many pieces. Presumably one piece got itself wedged, which made the brakes lock on, and the hammer freed it. New shoes and I'm on my way again.
That's frightening - imagine if it happened when you were braking at speed.