I accelerated and the back rear wheel was stuck (the left one was fine). At this stage I phoned someone and they came out and sorted the problem (by hitting the rear drum with a metal pole releasing the handbrake).
I took it to a mechanic who opened it up and said that there was nothing out of the ordinary.
Now, a few months later the same wheel jammed. This time however, it wasn't as tight (the car moved slightly as opposed to not at all, like previous). . .I engaged and released the handbrake about eight times, and kept accelerating until I hear the brake "pop" free and I was able to drive.
Does anyone know what's causing this? If a mechanic says there's nothing wrong with the inside of the drum then what exactly could it be?!
Will it be costly? . . .my first MOT is in November and I presume it's not going to stick during the test so it should be fine
Any ideas?

