On Wednesday, 10 October 2018 22:11:17 UTC+1, TimW wrote:
There's a small bit of land behind the house which has in the past had
horse/sheep in it and hence a galvanised drinking trough with a water
supply. The supply comes through black plastic pipe underground and I
don't know where from but I am pretty sure it isn't from my house. Must
be my neighbour but they don't know of any stop cock or anything.

It may come from the water main with a separate connection. It may not even be an official connection.

https://www.anglianwater.co.uk/_asse...g_2017_WEB.pdf

for water regulations guidance

Owain