biskitz4cheez wrote:
The radiators are filled with hot water from the combi boiler. I have
'bled' the radiator to let the air out and there's definately water in
there because some came out after all the air had been let out - it's
just not heating up.

I assume the upstairs and downstairs are on seperate zones. Make sure
that the circulator is coming on, or if you have zone valves, make sure
the zone valve opens fully.