Thanks for the advice, I’ll follow this up if I get no other suggestions from this site.
I’ve seen some posts with problems like this that suggest there may a temperature based fusable link within the machine, could this be a starting point for my investigations with my machine. This sounds to me a likely cause of the problem.
There is no temperature based fuse in this appliance I’m afraid, the information I think you refer to is the NTC device which monitors the water temperature but that wouldn’t make the dishwasher go “dead”.