Problem solved once and for all - I bit the bullet and took her to VRS in Northampton and let Will and the boys work on it. I expected a big bill when I came back to the car, but all I got was a £60 bill.
Essentially one of the control modules had a loose connection on it and that was causing it to spark and arc, this in turn was causing havoc with other control modules because it was losing its coding, this is what I was having symptomatic issues with other parts of the car, i.e., flickering lights in the dash binnacle, the sat nav sometimes forgot there was a DVD in there and stopped loading it, the battery warning light was also caused by this, it seems as though all is related.
So for me at least, the door handle was a separate issue, which is now fixed, the electrics are sorted and I am a happy driver!
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