Yep - they've got a virtual studio used for things like Orange Playlist, and I think the first series of Smile for CBBC was made there (though this is now made at Capital Group in Wandsworth)
They used to have a fairly large Transmission facility too - though I notice on their website this is played down somewhat - mentioning Sony Entertainment Asia and Sport on Five as their only remaining playout clients. I'm sure they used to do Bravo, Sci-Fi and Carlton Select / Carlton Food Network channels at one point. Did they used to playout UKGold in it's early days too?