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:-) Happy days Thanks for the advice, I replaced the pump....no difference, then did some root cause - despite switching currents coming through to the valve motor, the valve wasn't moving and moving it manually only provided brief (~ 2 secs) of heat, replaced just the valve head and hey...

I've got a 10 year old central heating system (Potterton Prima boiler, Grundfos Super Selectric UPS15-60 pump - all has been fine up until today. The hot water system is heating up fine but the central heating system is not getting hot. The boiler will run for a little while after cutting out...