On Wed, 5 Aug 2020 05:00:23 -0700 (PDT), wrote:

Today I measured my incoming mains water pressure to be a little
over
10 bar. About 145 PSI. About 100 metres "head"

Ouch, I'm surprised, are you sure of the accuracy of the measuring
device?

Most (metal) domestic plumbing bits are only rated to 10 bar. Plastic
and hot a lot lower. A little bell is ringing that says the maximum
mains pressure ought to be about 6 bar. See what the Ofwat site has
to say?

--
Cheers
Dave.