Correct. I checked the outer cable to look for any damage and none evident but you've advised to under the outer cable and check the individual cables which I will do at the weekend. I have removed the cover panels and I have replaced all the working components without success. When I unclip the lead and then reclip the lead I can hear a motor power up. So you are sugestsing that if one lead is fractured that may be the issue.
So on Sunday I will uncoil the cover and check every single lead in the hoping of find the fault 🙂