I get my cat flaps (yes, plural - my boisterous creatures have broken them in the past) from these people:http://www.masterplastics.co.uk/catflaps.htmThey not only do the standard flap that I use, but the magnetic ones, and a new version which works on the cat's microchip, and doesn't require the cat to wear a collar (mine won't). You could choose from there, then just get someone handy with a jigsaw to fit it. Once the hole is cut, most of the flaps are a standard size - I've replaced mine three times myself with no great difficulty.
Lorna Dodd ● 5704d