Boring one, but we were looking at getting a Drayton Wise Multizone system for our heating. The idea being we can warm the kids rooms rather than the whole house and be a bit more efficient (we are pretty good with our heating anyway but seems redundant to heat the whole house when nobody is in other rooms).
The outlay is looking at about £400 and we have a hub etc enabled already. Have you saved much or has it cost more?