Re kitchen pre-fit.
My kitchen sink taps have an earth loop on its own from one pipe to t'other with no earth lead link. I always thought that earth bonding had to be continuous in the the feed from the fuse board and had to be run from one earth clamp to the next without a break and all plastic fitting bridged,and of course ending at the last strap connection. The gas feed on the property side pipe also has an earth connected [said by British gas to be 6mm] but I have got to determine where that ends up.
Am I correct in assuming the earth is somewhere in the bungalow on the cold feed and the loop on the kitchen hot and cold forms the continued protection.
The earthing etc was already in place when we moved in. The water feed in is plastic with no visible signs of a bonding earth strap on the copper pipe [Internal] side of the mains feed. All I will say is if it's wrong then the electrician, if he was, was a bum or the ones who fitted the kitchen for the previous owners where cowboys 'job all' with no experience or concept of danger hence the introduction of Part P installation.