I 'reset' the thermostat thing and it clicked. I then reinstalled the original heating element and tried another wash. Still cold - as is the element.
Sounds like the element has 'gone' to me.
I've also noticed that the two lights on the left of the control panel are lit/flashing but this display isn't shown in the troubleshooting section of the manual....
I'm going to replace the heating element anyway and see what happens. Would you recommend this ?