As I said I used to be Corgi registered myself, so I understand the duty of care, my issue with them wasn't that they condemned the installation, but that for a flue problem they tore a perfectly serviceable 3 year old gas fire out of the wall and destroyed it so that it was impossible to reinstate, when I would have thought that capping off the gas would have been adequate, incredibly that they did not do, they left an open gas point that I had to blank off myself. At least if the fire had been left in, it would not have left a roaring draught through the open flue, in November in a house with no other heating and two frail 80 year old people living in it. They did not even have the common decency to take the dead fire outside, they left it on the front room carpet. Of course being old my folks didn't want to make a fuss so I wasn't allowed to complain on their behalf.
So you see why they don't want anyone in the house, so is the answer, no the existing heater can neither be upgraded nor replaced without ripping out the airing cupboard and half the bathroom, and what sort of electric heater can you have in a bathroom which is so small that it is all zone 1 or 2? without tearing the walls out?
I am really worried about them, the joke is that they could afford to have someone in to do it all and go off on holiday while it was being done. I could easily fit a gas valve and thermocouple to the existing cistern heater and at least make it safe, but the law will not allow me to do it, as my registration was only for industrial, although the training and exam are the same.Is there nobody out there that can make safety modifcations to existing installations?