I'd love our cat/kitten (9mths) to be able to get out in to the garden at night when we go to bed and he's put away in the dinning room. But the door in there is one of those double glazed jobbies and I'm not sure if you can put a cat flap in it? We do have a cat flap in the kitchen back door but we can't put him away in there at night as there is no door on the kitchen and I don't want him roaming the house and disturbing us. Any ideas?