OK, so I have tried to find the blending valve online. The model that matches visually is the Ecomix nickel plated mixer set UFH-EM15NP. This has a 30 to 65 degrees centigrade operating range apparently, which would suggest that it should work.
Thank you SpecialK, actually I have got individual temperature control, and hence actuators on each circuit. The idea here is to get the supply temperature right.
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