Think about how you use your home, and when you use the different rooms. Often it makes sense to turn off radiators in rooms that you seldom use, and put on an extra layer of clothing instead of turning up the heating.
If you’ve a boiler that’s more than ten years old, then maybe its time to think about a high-efficiency condensing model. If your home is large enough, you might consider as wood or wood pellet boiler, as it’s a renewable low carbon energy source. Open fires are high in atmosphere, but a wood stove can make much better use of fuel. Firewood is a more sustainable resource than peat briquettes or coal, and there’s other fuel briquettes made in
Upgrading to a smarter thermostat that responds to the outside temperature, and adding thermostatic valves to your radiators can also reduce your energy consumption.