Thanks AlanK
I did my original retuning in the general settings, having followed the instructions on E-69. I could tell by ear that it wasn't in tune. I've not had the time yet to go into individual zones and change things, so I'm pretty confident I haven't altered the tuning of a particular zone.
Prior to retuning, I was surprised to see that it was showing 440.0hz (as would normally be expected), given that it was way off tune.
I used course tune because I am saying , strange as it may seem, that my XWP1's tuning is out by an exact number of semitones and it's way off tune when set to 0. I have now reset my XWP1 to 440.0hz and M Coarse to O as you kindly suggested. Bizarrely, to get a concert A, I have to play a B on the XWP1, so it came to me tuned 2 semitones below pitch although it doesn't show this in the tuning menu !!
Whilst I'm not a novice musician I am new to synthesizers, so I'm definitely a novice on that score and I'm stumped what to do next.
Thanks again