Hmm, what's T like just now? At home he's quite demanding of time and attention. He will order DH and I into different rooms, usually insisting one is us takes E with us. He'll then pick one to play with and try and limit all contact between us. This could be verbally telling us, crying, or being naughty.
During the day when he's hime with just me he's pretty good. Will sometimes demand E go in her chair so we can play, but I think understands our play has to be with E, so it's not often an issue.
If a stranger visits our house he will almost climb himself into my arms, hide in my shoulder and go really passive and quiet. We don't have visitors often (all my friends disappeared when we had kids). He's ok with family visiting, and wants to monopolise all their time, though not as bad as with DH and I.
We have one regular playgroup that he's very happy with. He seems to know the parents and children there, and be happy to go play on his own. We've been going there since before he was 1, but we've known the leaders since PEEP, so at about 3m old. He will ask me to give E away to someone quite often though, so he can get some 1-1 with me.
Other playgroups we've been going along to for nearly as long, but which have a more fluid set of children/parents he usually wants me to follow him round and/or hold his hand while playing. He's often scared of boisterous children. He will run to me for protection from them, but also if he's stolen a toy, or thinks another child wants what he's got.
He's really happy to say hi/bye yo people when in the pushchair, and will sometimes talk to them properly. Other times he'll be shy and smile, but love their attention.
In a new situation with new people he will want me as close as possible, but will generally play well. He will talk to new adults if they're nice to him and let him take his time.
He's scared of dogs that are friendly, he loves dogs that ignore him. I think that kind of sums him up really :)
Helpful at all Utopian? If you want more detail about anything specific just say.