Thanks for the reply,
I assume by 'an equipment ground' you are referring to the ground that I already have at the house and would not be required in the conduit?
My main area of confusion is the two hot thing, as you probably know England is exclusively 240V except for industrial wiring that is and I have never come across more than one hot or live, what is the second one for, does it come from and go to the same terminals, is it simply to spread the load across two wires?
Just to give you a little more info, the run from the garage to the house is approx 120 foot, there is an existing overhead supply to the house which goes to a meter and attached breaker panel, this will be relocated to the garage hence the need for the underground feed. The supply will be 200A however some of that will be for the garage.
Thanks again
