On 28/06/2018 08:39, Graeme wrote:

Update.Â* Finally took the plunge yesterday morning and cut the hot water
pipe, and fitted the compression stop end.Â* This morning, still no drips
or weeping :-)Â* Tempted, of course, to nip it up a fraction 'just in
case', but will leave well alone.

It's probably not that great a risk in a domestic setting, but in
industrial and commercial premises, they go to great lengths to ensure
that there are no dead-legs in the hot plumbing as they can be a
breeding ground for legionella.

SteveW