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Many thanks for all your help. :lol: After having the pump changed, thermo valves changed, room stat added it appears that the GlowWorm 30Si has a possible design fault. All the dirt, bits of old pipework etc. had been flushed through to a spring valve that has no use on this boiler...

Many thanks for the info. All really useful and will hopefully lead to solution! As an update the system is 18 months old. Worked okay until last few months although never thought rads were hot enough and put this down to thermo valves. Pipework standard - 1mm I beleive. Boiler located in...

British Gas, Heatcall and now my original installer can't figure out this problem - PLEASE SOMEONE HELP!! Rads downstairs started to go cold, upstairs hot. Turned off upstairs rads and downstairs fine. Rads balanced - still same problem. Pump changed - still same problem. Now boiler coming on...