Plumbers and electricians, Do plumbers have regulations?


Today on our part rewire I came across this under the floor. I hope the picture I took is clear enough and I hope you can see what I saw! Yes that is burn marks on the ring main cables as it seems that a plumber had placed their hot water pipe directly over the cables.
In fact the pipe was touching the cables. It was very clear that the cables were there before the pipe work was installed. It amazes me that plumbers seem to be able to run their pipes anywhere in the home regardless of anything in the way!
As I am an electrician I do not know the plumbers regulations so I would really hope that someone could shed some light on the subject and answer this question for me?
Was this just a cowboy plumber ? Or is this standard practice in the plumbing industry ?

Us electricians have a guidance book ( 17th edition wiring regulations ) that we must follow to the best of our abilities. Do plumbers have such a book ?

If anyone can help me fathom out this them please contact me by email : gary@mylocalelectrician.co.uk or go to my website www.mylocalelectrician.co.uk and click on the contact link at the top of the page.