honeywell r6660d

Hi all, I have a GREENSTAR 30i ErP Combi boiler. Currently installed with a Honeywell thermostat. Looking to swap it over to a Hive heating setup. Can anyone have a quick goosey and let me know if I have the correct idea. Existing Thermostat. 1 Cable to Spur, the other to Boiler. No earth but...