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Tank appears fine - not too full, but floating the ball OK. Can't see a vent on top of boiler. Would this be on the boiler itself or in the pipework?

To be honest, not sure what position valve was in when I refilled - but the rads appear full and drip when bled from the top, so assuming OK. Have tried the central screw on the pump - and the air vent near the cylinder also drips when bled.

I had to drain my heating system to fit a new 3-port motorised value as the old valve had sprung a leak. This fitted fine and appears to work. However, on refilling the system I appear to have air in the pipes (microbore). The radiators are bled but when the boiler runs for a couple of minutes...