Another weekend, another energy-saving light bulb giveaway, this time endorsed by the Prime Minister himself. The Great British Light Switch sees energy provider Southern Electric teaming up with national daily The Sun to offer two free light bulbs with every Saturday newspaper. A total of 4.5 million light bulbs are due to be given away, which according to their calculations equates to a total electricity saving of 41GWh per year: enough to power 10,000 households and apparently save a whopping £20,300,000 per year!

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