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Its not a combi boiler, so how should I check the valve? is it the white box in the piccy?

Hi can anyone suggest what to try.... if we switch CH on and turn thermostat up,open rads then rads heat up... then if we switch thermo down and CH to off, all is well...until the hot water comes on and the rads heat up as well. We have now turned all the rads off... very confused...

pics of pipes