Mardon Supream 460/2-electric switches?

hello,
just aquired a Mardon Supream 460/2,can anyone help with the electric switches above the cooker position. Theres the car/caravan,pump,and a Day/Night one,-thats got me wondering,anyone know about this switch?. Also where i can get a manual,or info on running the systems?.

thanks and regards
dave...