OP
There are sensors outside for the lights. Do you think they may only work when it gets dark then as haven't tested that as im not there at night yet. Nothing seems to happen when I switch the 'auto always on 'switches or the grey switches. I'll have to go over one evening and have a look again. ThanksI would say, Yes it's for the lights.
1 each of the control boxes , will switch 2 lights, probably 1 for the front, 1 for the rear.
There will also be a sensor outside at the front and at the back that triggers the controls to switch on the lights and alarm, which I would guess would only be the buzzers withing the 2 grey boxes.
The switches on the grey boxes will probably turn the buzzers off.
The lights will stay on for a time pretermined in the control box.