Right, I've done the searches and found all the useful info on this site and elsewhere about how to clear an airlock.
Now it seems to me, if I've got pressure at the shower and flow to the loo (I think), but no hot and cold to the taps in the bathroom and the kitchen, I must have an airlock (if it is an airlock) between (1) where the cold feed goes to the shower and loo and (2) the boiler and where the cold feed goes to the taps. This being so, if I force some mains pressure water back up the taps is it going to clear the airlock if the boiler is in between? Presumably I just try to clear along the cold tap route and then the boiler will regain pressure once the airlock is cleared in the cold feed?
Now it seems to me, if I've got pressure at the shower and flow to the loo (I think), but no hot and cold to the taps in the bathroom and the kitchen, I must have an airlock (if it is an airlock) between (1) where the cold feed goes to the shower and loo and (2) the boiler and where the cold feed goes to the taps. This being so, if I force some mains pressure water back up the taps is it going to clear the airlock if the boiler is in between? Presumably I just try to clear along the cold tap route and then the boiler will regain pressure once the airlock is cleared in the cold feed?