Thank you for the response. Yes it is the top of the frame but they did go through the outer as well. This was just collateral damage on the way through. 5mm lower they would have missed the well in the top.
Hoping someone can confirm if a retro fit trickle vent has been fitted incorrectly (or correctly) as the drillings for the vent have also punctured the outer skin well of the window frame. What happens if water gets in there or is it just extra ventilation. Thank you
