I investigated it for a listed cottage we are the process of doing up but because much of it has underfloor heating the additional controllability was not much use because of the thermal inertia of the flooring.

I installed Hive a few months ago. I work offshore and sometimes (just as an experiment ) I check heating and hot water at home and adjust accordingly. Not been caught by the missus yet  Previous cars:
S-Max 2007-2013 (only diesel I've had, good car but expensive when diesely bits go wrong, so what's the point?)
Galaxy 2001-2007
Mondeo Estate 1997-2001
Sierra Estate 1993-1997
Uno Turbo 1987 -1993
Fiesta 1984 - 1987
Fiat 127 1982 - 1984