In fact wasn't BP pretty much permanently in TC2 (Lorraine's studio) during the last few years before moving to Salford?
Yes - I think the 'small studio' Blue Peter era at TV Centre was mainly in TC2.
I think in the earlier 'big studio' era - where the studio set was flexible and staged specifically for every show (as it was usually set each week from a modular kit of parts) - that TC4 was a popular home for the show, but all of the medium sized studios ( 3,4,6 and 8 ) could have been used, along sometimes with TC1.
A bit like Top Of The Pops- as we saw when BBC4 used to have their tweetalongs and posted scans from the PasC/PasB logs you could see it moved between studios 3, 4, 6 and 8 from week to week.
Oooh Looks like the older fans and parents of the kids who watch this are in for a treat seeing these old faces again.
I remember quite a few of the more recent presenters from the 00s (Konnie, Andy, Barney, Helen etc)
I also remember seeing Barney on some other CBBC stuff back in the day before he arrived on BP