outside pipe

Hi, I hope someone can help me. I had a water blockage in my kitchen sink on Easter and I got 2 different plumbers over for the rescue. While the 2nd one fixed the issue by tracing the issue to the communal pipe, he cut open the pipe in the process. He explained it's better to leave it open...

Embarking on a deck project soon, so need to lay some cables and pipes for a potential garden room to be built later on at the bottom of our garden, which is 40m long If we were to have running water in the garden room, can we run a speedfit / hep2o pipe along the party wall? Our side of the...