snip
Not long before I reading this yesterday one of my sisters, resident in Humberside, reported on Facebook that her ch had packed up. Reading this, I rang her and suggested that she checked the outlet. She phoned a few minutes ago and said that she hadn't been able to sort it out last night, it was too dark and getting too cold, but this morning, after removing the right-angle bend from the end a plug of ice fell out, so she had the heating back on before the plumber she'd phoned yesterday turned up. He said that he had seven more similar calls to attend to after hers. [Sister had had this problem before but didn't know what had caused it.] So thanks from brother in Leicestershire for the tip that helped sister in Humberside.