I've just turned all the radiators off but that one so I'll let you know tomorrow if that works but as you say it's probably blocked so then I'll tackle that problem. Thanks for the advice on capitals, I didn't realise!
Thanks for your ideas too on what it may be.
Regards
sjbis11
THE RADIATOR VALVE IS OPEN, THERE IS NO AIR IN IT AS I BLED IT, NO THERMOSTAT AND IT WORKED UNTIL ABOUT A MONTH AGO. THE WHOLE SYSTEM WAS FLUSHED OUT AND AN INHIBITER PUT IN ABOUT 18 MONTH AGO AND MAYBE IT HASN'T BEEN ON FULL HEAT SINCE THEN. WHAT DO YOU THINK?