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Thanks for the reply - the boiler is a WB Greenstar 30i. According to the installation guide it has an internal bypass, but also needs an external one. I've set the HW on, and closed one of the valves on the magnet device, which stopped the backflow, so my idea would work. But figure there is...

Tl;Dr: Can you wire 2* 2-Way values to operate together for CH? Bit of a long one, but here goes.. House has "Summer Radiators" in the batherooms that heat when the boiler is on - even for HW. System boiler & unvented HW (boiler and HW tank swapped 3 years ago) Asked plumber to remove Summer...