We have a UPVC door with 2 small glass panels at the top, 2 rectangular white panels in the middle, and another 2 rectangular white panels at the bottom.
The door is similar to this: http://www.polarbearwindows.co.uk/Uploads/CategoryImages/dbda6b9f-c6f8-4438-8e3d-82586b666455.jpg
One UPVC bottom door panel (white) needs removing, and to be replaced with a new panel which has a catflap installed (we will provide the catflap).
We need to keep the original panel to put back when we vacate the property.
I have left my email & phone number on here so that you can also contact me directly.