The message
from Ian Stirling contains these words:

With 22mm compression fittings, you'll have a job breaking the fitting
so that it won't seal by overtightening.
It's probably possible, but you'll need a long spanner, and the pipe to
be restrained quite securely.

Doesn't everyone use two spanners? Perhaps that's where all the people
who've been having compression joint fittings are going wrong, they're
just using one spanner!

--
Skipweasel
Pay no attention to that man behind the curtain.