As I mentioned the other day that I had failed to photograph the blue tits, that has been my mission.
This one and the cover are the best of a bad lot.

They are very interesting as they seem to be actively engaged in chasing which I think is courting. But I remember saying last year that there seemed to be a group of three - and again, there seems to be a group of three.
There are nearly always two around, but sometimes there'll be a lot more - and then the great tit and the coal tit and occasional visits from the long-tailed tits.
Tits, like the robin, have dark legs and long toes. The dunnocks have pinky-coloured legs and their toes are much shorter. They may not hang upside down like the tits, but it's interesting that they are so different from the robins.
In the wood, I watched a pair of blue tits foraging. The one who led to a new tree or branch would call and the other one follow - which made the leader look "dominant". But sometimes the follower would land right up against the leader, who would fly off a little, as though displaced. I think that ideas of hierarchy are always imposed... as I think that it depends what the creature is doing. I mean that in different circumstances a different critter is the boss, and often the relationship is totally equal.
I also saw how many of the blue tits in the garden raise their crests when they say me. But I think that Mohican Blue has his up a lot of the time.
Interesting observations. That's neat about the long toes (they show up nicely in the photo). BTW Do the robins ever hang upside down?