Hi Sennjan, Talking about cat flaps, a neighbour of mine was so fed up with other cats using her cat's flap, she went to a great deal of trouble and expense to fit an electronic one, the cat had a sensory collar which opened the flap when he wanted to get in. The only problem was, the other cats were having none of this and squeezed in with him when he used it, Charlotte from, Loughborough, Leicestershire.