I'm aware that this is an American site but just wondered if it is
accurate
enough to follow for my own project (apart from the obvious power
differences etc).

You are joking! US electrics are about as safe as attaching electrodes to
your genitals.

In the UK, current practices are entirely different in almost every aspect.

I intend to have a strip light and perhaps 4 double sockets for power
tools etc.

Personally, I'd wire this up with a "garage" consumer unit, such as

http://www.screwfix.com/app/sfd/cat/...06156&id=63138.

This would be connected to the house via armoured cable, the size of which
depends on the length your cable run, which you don't state. If using a
cable size calculator, remember to ensure that you still have some voltage
drop left to run the circuits. Either do a proper calculation, or go one
size bigger. The house end would run to an appropriate MCB fitted into a
spare way on the consumer unit.

The 6A runs the lighting circuit. The 16A, which can be uprated to as much
as 32A, if desired, runs the sockets. I'd stick a weatherproof socket
outside as well, to run the lawnmower. Inside, use metal clad sockets and
conduit. It will look nicer and be much tougher against inevitable dings
whilst working. Up to 20A, you can use 2.5mm T&E PVC cable inside the
conduit. Any more and you need 4mm or even 6mm, unless you run in a ring. A
radial may be easier in conduit, though.

Earthing will probably be TT via an earthing rod. You can let the
electrician you are planning to hire test this to ensure an adequete earth.
However, there's nothing stopping you driving it in before he/she arrives.

Christian.