Well, I've decided that Peggy is a superstar. She has just run into the kitchen, and didn't come back in a few seconds so I went to see where she was. She was stood on the back mat at the rear door.
I said "Do you want to go out?" at which point she pawed at the door. I opened it, and she ran straight out and did a poo!!
Brilliant progress, I'm so proud of her