Due to poor thermal insulation in older style homes, heat can escape through floors, windows, and ceilings.
As heat rises it escapes through the ceiling. By adding ceiling insulation it will act as a blanket to your home and prevent heat from escaping, keeping you warmer for longer.
Doors and windows are a culprit for letting in small draughts. By simply placing a rolled towel at the bottom of the door, it will help prevent cold air from entering.