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It was open before - I never considered reinstating it to be honest and have mild regret now that you mention it. I did leave it open and it is providing ventilation for the cavity behind all the boards (I deliberately cut all battens 30mm short each end so there is continuity).
New windows will have trickle so should hopefully not have any condensation.
Hovis
Looks great. We got all our external walls dot-and-dabbed with insulated plasterboard. Three of the four walls of our bedroom are external but it warms up really quickly now.
Was the air brick covered over by plaster? I'd keep it, or reinstate it, unless you have trickle vents I guess.