I'll even deliver!
I was woken up at 4.30 this morning by his lordship beating his cat door to get out. I tried to ignore him but in the end I let him out (the garden is cat proofed) and an hour later he came crashing back in singing the song of his people at the top of his voice! He can't meow during the day, it's more of a croak, but he seems to manage quite well during the night!
He's now catching up on some much needed sleep!