Hi Kevin, Many thanks for your quick reply to my query.
I would not have thought of the diode.
As the microwave is "working" at the moment, I'll be able to save some money towards the repair. As you said microwaves are not a subject of DIY. I will, however, just check the HV diode for my own information.
Thank you once again for your speedy reply. I will now complete the feedback form.
Regards ***** *****