Hi lovely people. Purchased a new sliding door mechanism/cables from kohaku.shop.They are a Japanese company trading through eBay. It took six working days to get to me. Not a bad price and excellent service.
Fitting went well, a bit of a squeeze to get the cables up to the hinge. I supported the bottom of the door and slackened the hinge this gave me a bit more wriggle room. Hope this helps someone in the future.