That second broomcupboard was officially known as Studio-P (for Presentation). I have heard it was used once on air by Noel apologising for the lack of a House Party for some reason but I haven't confirmed that and it may have been hearsay confused from the time he'd used the old 4th floor Broomcupboard proper. It had a single camera, a monitor stack and a desk with a small GVG vision mixer in it, which was supposed to have been used for the simpler CBBC links. There was a yellow/black CBBC backdrop installed so in theory it was the backup studio for TC9 though I'm not sure how many of us in the NTA could have got it working...! It was usually used by the announcers to record Learning Zone minidiscs ISTR.
It's a shame the camera didn't go through the
VT booths into the machine rooms to the far left - that's where the MARC machines lived and a whole stack of D3 VTRs (there were two MARCs, one for each network, one called Doreen and the other called Bertha..!). There was also a further room of kit where the Laserdisc machines and clocks etc for the networks lived. I very much doubt any of it is left of course as I imagine the area was filled with coding kit when it stopped being used for presentation in early 2000.
On the far right of the area, through the crew room was a library where the Obit tapes lived ... oh and loads and loads of Schools fillers, Christmas Ceefax discs and other occasional treats