Well after Z's little escapade this week, i must assume that kitties will get out windows that aren't secure!
Have gone round the windows. They don't have official nightlatches but have managed to set them up so that all the pushing in the world won't open them further!
The cataire system is intriguing but too expensive, I want to save as much money as poss for cat-proofing the garden. Then I can have doors open
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The flyscreen idea might work, how would you attach it to the frame? I have double glazing so drilling into it might compromise the system.