I have checked the Boiler pressure gauge and turned on all the radiators to make sure the thermostats have not stuck. So just now the house is like yours, Arcus.
When they have cooled [= tomorrow] I will bleed the lot, starting downstairs and farthest away from the boiler.
I have found the radiator key in its safe place! Result!
Then it's a case of re-setting each thermostat to the needs of each room, and we are in business
R. 
Originally Posted by: Roger Parsons