Thanks for the up to date photo, 02GF74, that's cleared things up. I'd tried the "looking" approach before, but the posts appeared to have threads on them. Reading about them was even more confusing as the words "cantilever" and "caliper" became one in my mind, not to mention that V brakes are actually also cantilever brakes.
I'm pretty sure, now, that I've got dual pivot caliper brakes with threaded brakepads.
Thanks for your help.