Ok, good to know i shouldn't be touching anything. I did purchase a Tado X wireless starter kit to replace the Honeywell ST699, am going to leave the underfloor heating as is with it's own thermostat.
Will get a gas safe engineer to install it
I've just moved to a new house and the heating system is a little confusing. We have an old dial thermostat which seems to control the radiators and a honeywell wireless unit that controls the under floor heating in the lounge.
I had a hive system in my old house and would like something...