BBC Master Turbo
This side view of Station 200 shows its stand more clearly. It is an Electro Guard unit and would normally be used for placing the monitor on top. However, in the case of Stations 200 and 201, it is used as a stand for the stand for Station 201.
I'm not sure what the circular hole near the front of the stand is for, but I do have a distant recollection from my schooldays that this might be some sort of security device allowing the Master 128 to be clamped inside the stand.