On Tue, 02 Mar 2004 11:46:22 +0000, a particular chimpanzee named The
Natural Philosopher randomly hit the keyboard and produced:

..perhaps you are right, in that as long as your landing is 6 feet tall,
and your doorways not much less, you can have a 1 inch high room,
provided its not equipped with electrical sockets (450mmm minimum
height) windows (mimum dimension for fire exit) trickle ventilation (min
height) etc etc.

Correct. Your one inch high room could have ventilation via a
mechanical ventilation system and your stair enclosure could be fitted
with fire doors on the ground and first floor removing the need for
external windows, and in any material alteration (such as a loft
conversion) there are no requirements relating to the height of
sockets.
--
Hugo Nebula
"The fact that no-one on the internet wants a piece of this
shows you just how far you've strayed from the pack".