Tado installation on Worcester Greenstar 25i ErP Combi + Comfort II RF

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Hello good people,

I have purchased the kit including Smart Thermostat (seems to be both wireless and has terminals at the back), Internet Bridge and Wireless Extension Kit and I would like to ask for some help installing this. Unfortunately I cannot find any electrician available before Christmas so I want to attempt doing this myself (I've been educated in HV systems, so familiar with the electrical concept, but never worked in this area).

Could someone please assist in wiring the extension to the boiler e.g should I use 230V Relay install, or LV Digital? Also what about S-Plan or y-Plan ?

Thanks a lot.