Multi zone novice

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Hi

My electrician is really struggling how to work out the tado installation at my house. I have rads upstairs controlled by wired smart thermostat and manifold downstairs heating 4 underfloor heating zones. I also have hot water control. Heat source is new worcester bosch greenstar and unvented cylinder for the water. There are 2 zone valves, one for manifold and one for rads upstairs. Currently I can't heat the zones separately so if downstairs is on then rads upstairs are on max. The electrician says that I need another wireless receiver to operate them separately. I refuse to believe this but the tado chat has been pretty useless in explaining what needs to be done. Any advice on here would be amazing.