For the second time in three years, wasps invaded around the edge of one of our Velux windows. They’re getting in through the gaps in the aluminium flashing where it fits around the slates in this photo. In fact you can probably see some of them. They then have a nest just above the window.
Unfortunately they’re then digging their way through into the room.
Not sure what the correct fix is for this. I assume that ideally those gaps shouldn’t exist. I may try cutting some slate shims, smearing them with something very sticky and pushing them up into the gaps.