Is it acceptable run main protective bonding conductor to central heating pipework and then link gas and water pipes under boiler?

On a shower installation,there are no mpb conductors at the consumer unit.Installing the conductors would cause

major disruption.Have  noticed central heating pipes above kitchen cupboards.Could these be bonded and then

bonded again under the boiler to pick up the gas and water supplies.?All pipework is copper.Thanks for any replies,

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