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Got it sorted, drained system , tested rad valves and there was a plastic piece blocking the lock shield valve, replaced valves also ( it was old). Working great now!

Thanks, I've now had a good look at the system, the pump is working, I've locked off the Lock Shield Valves on the rest of the system. Just had a hot inflow pipe to the towel rad: so it may be blocked. I'll try "Bucket Test" as suggested, flush system etc. Many thanks I post if all is...

I have one radiator ( towel heater) on the system that remains cold when the others are hot, This is a preliminary post, so I have to do a thorough investigation. I have yet to check the pump, flush the system, flush rad etc. The system is an open vented system. The radiator is downstairs...