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Only getting around to this job today, been all over the place as last few days, just wanted to clarify before installing cables, on the drawing for the uh4 it only shows a 3core &dearth going to the timeclock but you have stated you would run a 3 core + 2 core and EarthHeatmiser UH4 is definitely the way to go IMO. No need to use two separate wiring centres then as everything can be wired back to the UH4. Twin and three core and earth to programmer, twin and three core to boiler position, three core and earth to each thermostat position. All the zone valves, UFH pump and cylinder thermostat all connect to UH4.
I would install a rotary isolator next to the outdoor boiler for maintenance purposes.
http://www.theunderfloorheatingcompany.co.uk/wp-content/uploads/2016/04/UH4.pdf