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Ok. Thanks. I have just set all the upstairs lock sheild valves to half turn open. They were all open one full turn. All downstairs rads are open one full turn. I'll see what happens.

Thanks I'll give it a go. But why would the system fall out of balance literally overnight?

Boiler: Baxi WM 51/3RS Prog: Potterton EP3001 Pump: Grundfos ups 16-60 M-Valve: Sunvic SD 2701 7 Rads all with TRV 3 bed semi with Hot Water Tank. ================= Last week the downstairs radiators stopped working all of a sudden. I did the normal easy thing and bleed all radiators...