Thanks for your comments Old Timer. In conjunction with the post I also sent an email to Dimplex's customer support "
[email protected]". I got a reply from GDC Customer service acknowledging the problem with my fire and giving me a free phone number 0844 879 3588. I called the number and Richard has logged the problem and promised that an engineer will call to fit a new electric board within the next few working days. Some of my faith has been restored but I think there is still an underlying issue of design. Also, people like ourselves are handy and can investigate, understand and frequently repair these faults. How do people manage who don't have such practical skills?
One further question, does anyone know of the cheapest supplier of replacement bulbs for this fire?