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Muggles, thank you for the reply. Contamination of the mains water is not going to happen - any solution that doesn't inherently provide a type AB air gap will have an indirect feed instead, and I had already discounted the check valve! The changeover valve is a very simple option, but we...

I am putting in a rainwater harvesting system, but want to avoid (needlessly) pumping mains water from ground level. The system I am going with is a cold water tank in the loft, fed from the rainwater tank in the ground, with a mains water backup. Normally, the mains water backup is built into...