Thanks everyone for the advice and help you gave me, it helped and was much appreciated.
I got the new box on Friday evening and Ebbs ran out and into my bedroom while I was putting it in place but she came to investigate when it was all set up and ready...

hmm, what`s that?


I always stick my tongue out when I am thinking


Lets have another look


I`ll let you know later


She used it later that evening and again during the night so I knew she approved so I took the old box away. I haven`t put the swinging door thing on it yet though, I thought I would wait until she really got used to the box, then try it.