Been shopping tonight at Morrisons and noticed they had own brand energy saving lightbulbs on offer - 48p for a pack of two. Buy one pack, get two more packs free. They have 7W, 11W and 20W. These are equivalent to 40W, 60W and 100W in normal bulbs. Last for approximately 10,000 hours. The ones purchased were standard bayonet fitting.
Energy Saving Lightbulbs @ Morrisons 48p (pack of 2) - Buy one get two free! Instore only