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A bit confused by the latter half of your explanation. Basically you say 1/2 empty the rad nearest the boiler, but then what and what will this show?

I have a Glowworm swiftflow combi boiler (can't remember the model but it is the smaller one) and had no problems until a few days ago. I decided to bleed the upstairs radiators as the tops were a bit cool, and in doing so needed to top up the system, which I did. Unfortunately, a few mins...