Ask a sparky!! Usually replace like for like i.e if earthed originally then do the same again otherwise as said get in sparks.
Should not bury pipes in plasterwork - they need to be accessible (unless you mean behind plasterboard??)
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I can anyone help me? I have just had replaced the rads and have buried the pipes into the plaster work. Do I need to earth bond each rad or just the bathroom stuff? What size cable should I use, I have been told it should now be 10mm!
Thank you in advance