Installing Extension Kit with Hot Water Cylinder

Hello, as the Tado chat is pretty much not responding and they closed their phone lines, I am hoping someone here can help.

We have a Vaillant UniStor unvented hot water cylinder and a Vaillant EcoTec plus 618 condensing boiler. There is a Honeywell ST9400C control for hot water and heat next to the hot water tank. Furthermore there is a wireless room thermostat I want to replace with the Tado Room Thermostat. I have fitted each radiator with a Tado smart thermostat.

I now want to install the Extension kit to the boiler, and install the Tado Room thermostat. However, I think I prefer not to mess with the Honeywell control for the Hot Water and leave it to control the Hot Water as I see no specific benefit to having Tado control Hot Water and don't want to mess with that system.

How do I get the Extension Kit NOT to control the hot water? And how do I set the Honeywell for the Heat once Tado Extension kit is fitted - just to CONTINUOUS heat?

Many thanks!

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