Having a house built and the plumber has used hep2o pipe and copper Yorkshire push fit fittings. He is a friend and says he swears by it and has used it for years. The fittings were expensive as he knows I wanted quality and future guarantee . However, another plumber visited the house and says.they are not compatible and I should use plastic push fit with plastic pipe etc. It's not boarded yet so we could change them and I even said I will pay for the wasted fittings( apparently you don't pull apart and we must cut the pipe etc) but the plumber is still adamant that it will be fine. He even said he has contacted both manufacturers and they say it's fine. Please let me know your thoughts , am I just being paranoid. Thanks