Water pipe burst

[Howdy84]

Hi I've just had a carpet fitter in and they've burst a pipe. They've said the pipes were too close to the surface and it is against building regs.
I was wondering if someone could confirm the depth they need to be by building regs and when this came into affect.
Thanks in advance.

 

[Nozzle]

50mm I think. Are they trying to suggest since it's against building regs they are clear of all responsibilty?

Nozzle

 

[Howdy84]

They were. I posted a new link as realised thus was in the wrong place. So further details are here.......... //www.diynot.com/diy/threads/burst-water-pipe.446030/#post-3500480