Not every saving needs a big spend or a contractor. A handful of cheap buys, none of them more than the price of a takeaway, each pay for themselves within a season or two, and stacked together they take a meaningful slice off a bill. Here is the shopping list, with what each one actually does, so you can spend a tenner at a time and see it come back.
Draught strips and excluders
A few pounds of self-adhesive foam or rubber strip seals the gaps around doors and windows, and a door brush or excluder stops the draught under an external door. This is the classic quick win: cheap, quick to fit, and you feel the difference the same evening because the room holds its warmth and feels comfortable at a lower setting. The full method is on the draught-proofing guide, but a single strip pack is the place to start.
LED bulbs
A single LED bulb costs little and uses a fraction of the electricity of the old halogen or incandescent it replaces, lasting for years. Replace the bulbs in the rooms where the lights are on longest first, the kitchen and living room, and each one pays for itself quickly. There is no cheaper fit-and-forget saving, and you can buy them one or two at a time.
A chimney draught excluder
An open, unused chimney lets warm air stream out around the clock and can be one of the biggest draughts in the house. A chimney balloon or a wool chimney draught excluder costs only a few pounds and plugs the gap while still letting the flue breathe a little. Just remember to remove it before lighting a fire. For a house with a redundant fireplace, this is a surprising amount of saving for very little money.
Pipe and cylinder lagging
Foam pipe lagging slips over exposed hot-water pipes for a pittance and keeps the water hot on its way to the tap, while also protecting cold pipes from freezing. If you have a hot-water tank, a cylinder jacket is one of the fastest paybacks of all, stopping the heat you have paid for leaking away while the tank waits. Both are cheap, both fit by hand, and both save every day.
Radiator reflector panels
Behind radiators on external walls, a reflective panel or even foil on card bounces heat back into the room instead of letting it soak into the cold wall and escape. The saving per radiator is small, but the cost is tiny, so on the radiators that sit against outside walls it is worth doing, as the radiator reflector guide explains. Only bother with the ones on external walls.
A plug-in energy monitor
This one does not save energy itself; it tells you where to look. A cheap plug-in monitor sits between an appliance and the socket and shows exactly what it draws, revealing the hungry devices and the worst standby offenders so you can act on facts rather than guesses. Used to find one genuinely thirsty appliance or a power-hungry old set-top box, it pays for itself many times over. The energy monitor guide covers how to use one.
The radiator key and a shower timer
The smallest buys of all still earn their place. A radiator bleed key costs almost nothing and lets you bleed trapped air so radiators heat fully and the boiler works less. A simple shower timer, or just a chosen four-minute song, nudges shorter showers and less hot water heated. Add these to the list above and you have spent a few tenners across a season for savings that repeat for years.