What else do you do with your Hive system?

[StuntNun]

I've just installed a Hive active heating system and I'm wondering what add-ons might be worth investing in. So far I've got:

1. Smart plug for the immersion heater so I can turn it on and off from my phone (the switch is in the loft for some bizarre reason!)

1. Smart plug for a lamp so I can set it to automatically turn on at sunset.

1. Thermostatic radiator valve for one room that's always colder than the rest of the house (because the radiator in it is small and poorly located, not because the system is imbalanced,)