Regarding the earth.

So, you take the cable from the house csu to the shed and do you
connect the earth to the shed csu or direct to the earthing rod.

The which? book doesn't make this clear and actualy says not to
connect the houseshed cable earth wire to the shed csu, connect the
shed csu to an earth rod, but what would you do with the houseshed
earth?

It's probably obvious to you all but not to me.

Always make the system separately earthed from the house circuits, but
this
doesn't mean separating the bonding on the SWA cable between the two
points.
Use the house earth to protect the outer skin of the cable between the two
consumer units, but have a separate earthing rod into the ground locally
to
the shed and connected directly to the earthing bar in the shed consumer
unit. It doesn't interfere with any of the systems proper working
profiles
and just gives the added local protection needed for this type of
installation. Make sure that the impedance between the rod and the ground
is as low as humanly possible, so this night mean you have to bang in a
two
metre length of 15mm copper pipe to have a proper protective local earth.

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