A couple of recent reports of the garage electric roller door, being found open, when it had been previously closed. So I thought to ignore it for the time being, and see what developed...
In other reports, Avril was saying there was a draft from the bay window, when the wind blows. The bay faces the westerlies, and the draft appears to come from between the internal timber sill, and the top of the plastered wall. The gap is very narrow, so not sure how to deal with it on the inside. We have CWI.
Checking the outside of the bay, there are three brick sized cavity vents along that front wall, two levels up from the DPC - one of which is in the middle of the bay. As a trial, for the next time the wind blows, I've cut a brick sized sheet of alloy, which I have stuck over the bay vent, to see if that helps.
Whilst on with that, I caught the garage roller door opening up, all by itself, several times. It has two radio remotes, and a wired remote. The controller was flashing one of it's LED, as if it was getting some sort of signal, to do something, so probably a job to investigate tomorrow. For now, close it and switch the power off..