On 17/02/2004 Martin opined:-
Thanks, To my delilght I've found I do have cavity insulation. Found this
when I started installing security lighting outside, thought then I could
drop the wires down the cavity, in the end I located the lights at the first
floor level and drilled a hole straight in under the floorboards.

You are not allowed to run mains cabling in the cavity, though
obviously you can pass cables straight through them. Cat5 would not be
a problem run in the cavities.

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Regards,
Harry (M1BYT) (L)
http://www.ukradioamateur.org