I've found everything from 1 bar to 11 bar here in Guernsey.
The 11 bar situation was noticed by me when I was at a customer's house that was being renovated and I noticed the hose on the garden standpipe had a bulge in it like a snake had eaten a guinea pig whole. So I got the gauge out and showed them. Sold them a PRV for the house after that.
Dropped from about 80PSI to 35PSI near Bridgwater a few years ago which was a bit of a bummer as we used to pressure test a 50PSI steam boiler direct off the mains.
Years ago in Alston, ***bria, I could direct inject water into a steam loco running at 160 PSI off the mains!