Mars is kicking off a £1m campaign for a limited-edition relaunch of Mars Dark. The 'Do it in the dark' print and online ads begin this month and build up to 26 October, when the nation supposedly experiences a collective energy slump. Mars Dark (rsp: 45p), available until the year-end, is expected to rack up sales of £3.5m. It previously appeared in 2003 as Mars Midnight, also as a limited edition.

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