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Is this method of earthing a water pipe permissible?

A house has the main earth terminal block located next to the electricity supply cable in a cupboard in the living room. The water supply is a blue MDPE pipe located in the kitchen that transitions to a copper pipe about 2m before the stop tap.

About 1m away from the earth terminal block are a pair of copper central heating flow and return pipes. These same two pipes are located right next to the copper water supply pipe in the kitchen.

The easiest, and most economical on cable, method to earth the pipes is to connect the earth terminal block to the central heating pipes in the living room, then connect the central heating pipes to the water supply pipe in the kitchen.

Is this permissible, or must a long length of earth cable be installed under the floorboards connecting the earth terminal block to the water supply pipe?

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