Goat Willow Great Tits

I heard a great tit calling from deep inside a goat willow. Eventually it showed itself. It had a caterpillar dangling from its beak. (Extras) I watched it for quite a while. It was able to call even though its beak was full. I guessed that it was an adult calling and trying entice its brood to fledge. It came more out into the open and hopped back and forth along a branch bordered with rough chervil. After quite some time the fledgling above appeared. I was able to get very close. It seemed quite confused and kept flapping its wings but not flying. Eventually it plucked up the courage and half hopped, half flew into the bush to join its parents.