Erm.... maybe 18 months old
Thanks Michael I will have a look at what you suggested in the next day or so and will get back to you either way. Cheers.
I have looked at all connections on the heater and indeed verified that the heater is receiving a supply. Heat returned temporarily again whilst I had the heater open but had gone again within 5 minutes. Either the cabling further inside is damaged or the thermostat is defective. As the machine is 18 months old I have decided to buy a new one for the sake of £289!! Thanks for your help.