Paul,
I gather that the Incoming main is on the left side?.
Also, you mentioned above that this is SWA cable, is there an actual connection between the Armouring on the Main and the Earth wire to the Consumer Unit in the picture?.
Metering of these supplies sounds like a good idea, over here the Customer pays a flat Tarrif in a Caravan area and the supply is un-metered.
However, the fusing that I've seen feeding these installations tend to be rather conservative.
I've replaced many a fuse because Mr and Mrs Holiday-maker tried to boil the jug with the 2 bar heater and the TV on.
BTW, Paul, is RCBO protection required in your caravans in the UK?.

{Just as a small aside Paul, I know what you mean about these mini-cams, although mine has a flash, using it can ruin a perfectly good picture.
The most infuriating aspect of this is, you don't know what the pic will look like until it's on the computer screen!.} [Linked Image]

[This message has been edited by Trumpy (edited 04-09-2004).]