I was sitting in the living room tonight and instead of tapping at the cat flap like he normally does, our adopted cat gave an enormous miaow/yowl. I could hear him above the TV!
He then came in, had some food and drink, sat by my feet for a few minutes, purring very loudly then: Miarowwww… He’s up and wants letting out again. That cat has got powers of persuasion! No doubt he will be back in an hour or so.