An update on my failed loco. You will remember that she gave up the ghost and when I contacted Hatton's I was told to find an outlet that offered a repair service. I did as asked only to find, (surprise surprise) that no-one was interested as they would be unable to source any spares. I went back to Hatton's, escalated to a manager and said I was less than happy with the state of affairs and asked him to reconsider the position Hatton's were taking given that their first suggestion was dead in the water. I was asked to wait a couple of days and was then contacted to say they would do a repair and would cannibalise spare locos they had to source any spares. (From my description of the failure they are suspecting a failed circuit board). They have promised to examine the loco and provide a repair cost, based on the cost price of any spares needed and would have to work out how they would price he labour. Only after I agree to the repair cost will they start work.
All in all a much better, (and more sensible) response. The loco has been despatched today so now I just have to see how much they intend to charge me!
Many thanks to all who provided assistance with this, especially Stewart Ingram with his offer of a repair.