Well thanks everyone for your help and advice. I tried everything and nothing seemed to do the trick. In the end I bought a new caliper and put it in this morning in the sunshine. All went suspiciously smoothly and when I pulled the handbrake - hey presto it was properly engaged. Test driven and all is fine. I think the handbrake mechanism may never have worked (we've only had the car for a year) on the passenger side - I say this because the handbrake lever now max's out on 6 clicks or so, whereas before it needed to be pulled right to the top - that's without me touching the handbrake locknut. I did notice that the driver side handbrake cable has some snapped strands at the caplier lever end which probably adds credence to the above. I've got a spare cable to replace this but it can wait for another day...... Now both sides are working as they should the stress on the cable will be reduced anyway. Once again thanks all. Ade