You certainly can get one that answers your requirements. Have a look at Honeywell's evohome system. The whole system does cost more than just replacing your thermostat, but you get individual control over each room. This means I can choose to only heat the bedrooms in the late evening, but keep the kitchen warmer all day.
I only installed it at the end of the cold period so haven't yet got a view of the savings, but I do know that it was noticeable that most rooms were cold when not needed but warm when they were. As a plus, rooms heat up faster because you're not trying to heat all radiators at the same time.
Biting the hand that feeds IT
