I realise it's been a while since I started this, but finally got it sorted out this weekend.
Despite having all the dash indicators correct and no warning lights my xyz switch was, indeed, the problem and after changing it for a refurbished one, that's an adventure if you have big hands, I now have reverse lights (led bulbs to reduce the load) and rear wiper in reverse again.
So, for whatever reason, it would appear the reverse lights not working was the first symptom, I imaging the rest would have been along if I had carried on.
Thought I would share my conclusion.
Thanks for all the help from all you wonderful people

