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What do I buy to replace my Nest system

I would love to move to Tado, but I'm finding it bit daunting.

I have a Nest thermostat that an engineer installed. There are two Nest controls (upstairs and downstairs) which are connected via cable to two Nest link devices in my hot press room (pic attached). We have two zones, upstairs and downstairs. I would like to control more than just upstairs and downstairs, I want to control each room.

What do I need to buy?

I am thinking of two packs of these smart radiator thermostats -

One of the Wireless temp sensors for the main bedroom because it has two radiators and I think I need this to control both radiators.

Do I need an internet bridge? If so, I should probably buy a kit like this one?

My current Nest app is able to control the hot water too. Our hot water is separate from the radiators. How does the Tado system control that?