We’ve had this the past 3 years. Starts with spotting one here and one there. Next thing you know there are 10 on a window sill every morning, then they try and take over your house.
The ones we have stink so I believe they are an invading species from Asia. I assume they are picking on me as I voted remain and they see me as a soft touch.
This Autumn my son reported finding loads in his room and when we opened the windows there were thousands of them in the mechanism and in all the gaps they could fit. I ended up hoovering them up from around all the the windows upstairs and at the front of the house. It half filled the see though cylinder on our Dyson and it stunk for days after. Felt a bit brutal killing them like that but apparently they are killing of indigenous species so in the words of Pope Jean-Paul the second f*** ’em.