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Originally Posted by budkor22
I am not sure where "at least one 'E' pin of a 230V 3-pin walls socket" comes from
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Every 230-v.a.c. 3-pin socket in your house may be on a ring or it may be on a spur - or a combination of - a spur from a ring. For every socket, there should be at least one wire connected to its 'E' socket. The other end of that same wire should terminate in the MET at your consumer unit / distribution board / fuse board, where the incoming mains supply is distributed to the rest of your house via various protective devices. The wiring from the MET should go to an earth stake in the case of a TT system, be connected to a supplied earth line coming into your house and / or bonded to the incoming neutral for other types of systems. However, in all of those cases, the MET will connected to true earth - or certainly should be.
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All the wall sockets have no 'E' pin connectivity to the water pipes in the sink. Not even one.
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That is an area of concern: shows that 'electrical bonding' may be inadequate. What is of more concern is the connection (or absence) of the 'E' pin of every wall socket to true earth - as explained above.
One other Q.: when you are checking 'connectivity', what equipment are you using to determine that connectivity, or lack of? In retrospect, this is a Q. that should have been asked much earlier - however, better late than never.
Al.