Steven Oakes wrote:
Thanks Jim - I'll find out what the cause was. I wonder if I can top mine
up in the meantime - its a bit chilly to rely on a fan heater at the
moment.........

I should say that the only reason that worked was because the top of the
towel radiator is the 2nd highest point in the system, and thus above
both the blockage and the pump. Wouldn't have worked with a normal
radiator (can't pour sideways anyway!).

Jim