In an earlier contribution to this discussion,
James Abley wrote:


Rules - as in building regs, or laws of nature rules?

Both. The building regs include rules about where holes and notches can be
in order not to compromise the structural integrity. They have been quoted
in this NG in the past, but I can't quote the exact details offhand.

I have the existing lighting circuit which carries 2 100W lights on
the garage joists. I need something similar up in the loft part so
that the newly floored part will be lit as well.

Assuming it uses 1 or 1.5 M^2 cable on a 5 or 6 amp fuse, there's no danger
of overloading it by adding another couple of lights.

The wife's asked
about me putting in new sockets on the power circuit - not sure about
that one!

In the garage, or in the house?

Your terminology worries me slightly when you say things like "it can't be
too difficult". I would be happier if you demonstrated that you knew how you
were going to go about it, and were simply seeking confirmation of your
method.
--
Cheers,
Roger
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