On Aug 22, 8:14*pm, Jim K wrote:
can you measure comfort any other way??

Yes, lack of discomfort :-)

Internal insulation means there is no delay to the room warming up;
that is to say you are not having to heat the inner leaf of a cavity
wall which even though it is insulated is slow to warm up from (say) a
background temperature to a higher comfort temperature.

So internal insulation is very useful for rooms which are only
occasionally used and "on demand heated", such as utility, box-rooms,
storage rooms and so on. Whereas external insulation is good for rooms
continually occupied 24x7 where you want a high thermal mass to even
out the daily cycle and high thermal mass to not suddenly go cold when
an outside door is opened.

Frankly I wish UK construction would go the way of those clay-stick-
together-jumbo-blocks. Unfortunately they are actually pretty
expensive, the saving is in labour which will never catch on with the
UK construction industry (or politicians).