It got me today. 64 reg Octavia.
Replying to this topic although seen a couple of theads such as this one:
It has popped off before and the local VAG garage said no issue found.
Today I heard a familiar sound, looked out the window and watched my car roll down the drive, across the road and into the leylandii hedge opposite. Brilliant. Light bumper damage but thankfully no people or property damaged.
Found the handbrake down, button in the drivers footwell and the spring on the rear seat. (some photos show a cup like washer but not sure if I should have that).
I can fairly easily pull the button out when put back in so guessing its worn. Tested as @lex131 suggested in a post. Pulled the rod out and raised the handbrake. If I pull hard enough I can feel / hear the rachet effect as I raise it. So dont think its the mechanism (open to suggestion otherwise)
Took some photos of the old parts. Got a new button on order from local Skoda dealership. £4.75ish part number 5F0711333A 2ZZ.
Will update with new part vs old part pics and if that fixes the problem.
And yes I push the button when raising it and dont park in gear.... well I will now.