She's a smart one with cat flaps, Rosella.
![smile :)](https://www.purrsinourhearts.co.uk/Smileys/purrs smilies/smile.gif)
We didn't even show her ours, she just saw the others going in and out and decided she wanted to as well! (She had been here three weeks at that point.)
I have to admit, my partner was the same as your OH. He felt it would've been safe to let her out a week earlier, but I was paranoid as she wasn't chipped - the night before we got her chipped she made the decision for me!
Glad it's all "so far, so good!"
![Grin ;D](https://www.purrsinourhearts.co.uk/Smileys/purrs smilies/grin.gif)