This photo is of the machines bays on the right hand side as you walked into the VT area from the main post production corridor at Pebble Mill. The jackfields contained most of the connections between the VT area and the other parts of the building.
The door to Dub 1 is on the left hand side at the back of the shot.
The photo probably dates from the late 1990s.
Thanks to Russell Parker and Stuart Gandy for adding information to this post.
Ray Lee added the following information on the Pebble Mill Facebook Page: ‘As Stuart says this was the VT Bays area just outside Dubbing 1. There were a stack of VHSes and the bottom LH rack I believe was Vision distribution amplifiers, (there is another set at the top of the middle bay). The panel below the monitor was a routing panel, but I can’t remember whether that was just for the VHSes and monitor, or whether it could also select other destinations as well. This was part of the re-engineered VT area when SDI (Serial Digital Interface) had been installed for routing combined sound and vision around the VT Suites. These 3 bays were the analogue vision and sound distribution, when separate non embedded audio and vision were needed. I think the black box top left was a stereo PPM.