On 08/12/2010 19:10, Tim Watts wrote:

But I've also had copper freeze without issue - in fact the only burst
pipe I remember was a lead one which did split very easily.

I had amusement fitting a tee to a 15mm pipe which had got ice in it at
one point and was thus a bit bigger than 15mm.

Eventually solved by taking a yorkshire fitting and shoving a socket
from a spanner set down it using a vice to stretch it enough to go over
the pipe - I was lucky enough to find one in my collection which was the
appropriate size.