Yes I have seen this too. Also the Jay and Magpie in the last few weeks. The tits are weeny at the moment and very vulnerable. Mr Blackbird swooped down and attacked the Jay last week as he was approaching fairly porky baby blackbird, but what a squeel came out from the Jay, shame as we don't see that many in the garden but can have the babs attacked!!!
Must tell you though Shaking, if it helps, we had in our garden last Sunday:
baby blue tits, great tits, spadgers, (lots), blackbirds, Dunnocks, wren, and the best one, woodpecker.
It was great day and also Mrs Blackbird who we had not seen for weeks turned up with a new pair of babies, two litters in two months!!