Honeywell ST699 with Drayton digistat SCR

Janel
Janel

Above is my present heating system, connected to an outside oil fired boiler. I've been trying to install the tado Smart Thermostat V3. i have come unstuck on the extension kit. I cannot work out what I am supposed to do, and the 'technical support,' is not helpful. Has anyone got experience of this system? And if not, does anyone know how I get my money back?

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