I have an oil fired combination boiler. Living in Watford Northampton we don't have gas.

Is it economical for me to leave the heating on all day and control with the thermostat and keep the house at a constant temperature? Or should I have the timer switch on in the morning for a couple of hours then in the evening for 5 or 6 hours? The latter involves heating the house back up from cold.

Just wondering and seeking advice.