That is an Amek/Neve 9098i - one of the kings of analogue, but fully automated boards. Very GAS worthy. ? Google it and drool...
Gearhead wrote
Could someone talk us through this (sort of) setup?
The most important thing to understand is that these are modular systems, so are assembled and set up to customer demand. They are reconfigurable to some degree too.
What would the main difference between the left set and the right set of these channel strips be?
No difference. Having the master section in the middle is a convention often used on bigger boards to keep the workflow manageable.
Am I understanding it correctly when I suppose that there are 4 group channels immediately to the right of the left set of strips?
No. Those are stereo input channels. The groups/bussing is all done on the master setting. The bus faders are hidden by the engineer in the pic (which doesn't have the fader sections shown anyway).
Obviously the VU meters up top relate to the strips they are over, but why are there three in the center? Etc...
I think those are assignable or switch depending on the bus you are busy working on in the master section. Once again the modular nature comes into play though - you can see an analog meter module on top of the meter bridge which is normally fitted inside the master section of the bridge. There is also the LCD screen above the master section, right in front of the engineer.
Big G wrote
24 channels on the left, and 24 on the right
I think you'll find its a 72 channel (counting the stereo input channels on the LH module), so 36 right, 36 left. The 9098 was available in up to 96 channel for standard configs, but I've seen some absolute custom monstrosities with up to 4 x 48 channel input modules: