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Got the piston moving and like you said, it's threaded.. Don't quite see how unscrewing it will help me to get the pads in as that onl makes the gap smaller...
Am I being really dumb and missing some mechanism that locks the piston in place...?
Try turning it the opposite way, so as to open the gap (there is a special tool for doing this, Halfords sell em £20). Undo the brake fluid cap as you will be compressing the pistons. Make sure none spills on anything