Although interestingly those settings are still too quick for me! It's turns PiP on fine, and switches between them fine, but doesn't turn PiP off - even with a 1.5 second delay. Although my mini is quite old, so is probably slower than yours!

It's fine like that though, becuase if I just hit the button again it switches PiP off.

Thanks again for your help, that's something that's been bugging me for ages about my setup.