...Sadly this doesn't seam to be the cause of my problem - I slackened off the cable (it was on the centre grove both sides anyway), but then I couldn't open the doors from the inside!

I tried it anyway, but the locks still pop open, so it looks like a software / solonoid / sensor problem.

Thanks for your help anyway Leigh - it's a handy hint for other owners at least.

Any other ideas?

Cheers

Rob