Happy windows make cat window safety screens to fit any size bay windows without the need for any nails or mess.
This is a perfect compromise for cat and owner especially for those top floor windows!
For more information go to: http://www.happywindow.co.uk/
All clients of mine can get a discount with a referral code.
For any further cat behaviour related advice or for a cat behaviour consultation please email London based Cat Behaviour Counsellor firstname.lastname@example.org