Bonding of Shower

[Killer]

I know this subject comes up a lot, but there i'ms truggling to find a definitive answer.

if a shower is wired with 10mm2 twin and earth, and the cold water feed is bonded elsewhere in the room (ie to hot water + Central heating), and the shower has bonding internally,
does the shower require further bonding and if so to what?

if the water pipes and central heating pipes are all bonded within a bathroom, do they need to be bonded back to main CU or does the bonding at the Main CU to these pipes suffice?

 

[Chivers7]

//wiki.diynot.com/electrics:sp...l_bonding:supplementary_equipotential_bonding

Have a look here, it's important that the pipes and other exraneuos parts are supp bonded together so there is no chance that current can flow between any of them to prevent anyone from providing a path and hence getting a shock. You do not have to run a cable back to the MET