Then u have a love cable terminating in the wall.
I know of a situation exactly as that where the customer then decided to move the wireless thermostat and fill the hole.
He was electrocuted
Not my installation I might add
So. With great care and perseverance i have successfully installed a hive 3. Everything works great, as a standalone and with app as well.
I noticed the receiver (not the hub) has an ethernet port. Any one know what that's for as it doesn't appear anywhere on the manual