Well we have gas. Our CH setup is that rads have TRV, the CH and HW supplies are separate and contolled via motorised values. I have controllers for both CH and HW that can be set for up to 6 different periods per day. The year prior to the child's birth, with typical periods (i.e morning/afternoon/evenings & weekends) was say €x. Once the nipper came along, and we minded her at home for the first year, we switched the CH contoller to be a constant termostat, and manually adjust the temp throughout the day as we saw fit and turning it down say over night. As a result the house was constantly comfortable/warm but guess what, for the year the cost was also near enough to €x!!!! So we have kept it that way!!
No waiting for the house to heat up etc...
You should give it a try, its not as if the boiler is buring 24hrs per day, only just when its needed.
S.