So I changed the handbrake cable from the lever to the t bar, adjusted my pistons out to provide friction on the rear discs, then went and tightened the adjuster on the lever. Handbrake for a start was bang on, took it for a run to bed the pads in and sure enough the handbrake needed re adjusting at the lever. Did that and it holds but it's not amazing. Dad had a corolla gti twin cam and he said it was exactly the same so aslong as it passes it's mot I wouldn't worry too much about it Colin John