I have a double glazed south facing conservatory which allows passive heating into my bungalow. Even in Winter, its unheated, but Winter sun is sufficient to warm the conservatory, and provide passive heating, reducing the need to turn on heating in the daytime. 

In Winter, I set my thermostat to 18C, and only boost the heating as necessary in the evening. Any rooms not used, have the radiator valves turned off. The time clock controls my heating to come on automatically, and for me, I do not need heated rooms over night, so the heating goes off at 10.30pm.

Another saving I have found, is not to have the hot water turned up too high, it is pointless heating water to high temperatures, then having to cool it down with cold. However, now and then, I allow the boiler to reach 60C to kill any bacteria in the system, then lower it back again.

I do keep my boiler serviced every year, and insist the engineer checks for maximum efficiency. Our previous boiler was useless, it took ages to heat water, and was barely adequate to supply hot water to all radiators. Old boilers are a false economy, and I saved money instantly when i switched to a Greenstar boiler.

I think if people are careful with electricity and gas use, they can still save money.

The Ovo in-home display is a great gadget for monitoring use of electricity, but I still appear to be having issues with SMETS2 meters not communicating with Ovo. They have both been changed to the latest versions, but still, the system is not communicating. It is a puzzle I have to resolve!!!