Ed Sirett wrote:

THE PERMITTED LEAKAGE FOR PIPEWORK (new or old) IS ZERO. I.e. less
than
0.25mbar/2min on a normal installation.

So 0.24mbar/2min is okay? ;-)

As it happens, my pipework seems fine and since redoing my dryer connection,
my "appliance leak" seems to have gone too.

Thanks for the info.

Tim