My guess is "3-ish"

I got a bit concerned about some work I was doing, 'phoned our water
provider and asked. We'll check they said.
I awaited their call.
Meanwhile I asked No 1 son, Civil Engineer in water elsewhere in UK
answered,
"Don't be daft, most are about 3bar + or -. "
Then our Co called back... The Chief Engineer of the water Co.
where I live called back. He replied it's about 3.5-4 when it leaves
our header where you live, so based on your postcode, 3 bar would be a
good number!

Ho Hum
EP