Horizontal pipe runs on vented systems

Good morning Gents!

I keep getting asked by a loft company to move header tanks in the loft.

Long horrible horizontal pipe runs.

This of course creates tremendous ball ache with air locks etc.

The heating is always converted to unvented but the hot water.....

Can someone point me towards regs, guidance, standards, literature etc saying you should not do this?

I want something to wave in their face.

Many thanks,

Jerry

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