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The defection follows the decision by General Motors to move its business from Initative to Carat, which, like Posterscope, is owned by Aegis. The deal, which includes brands such as Vauxhall, is thought to be worth between £5m and £7m, lasting up to five years.

Steve Bond, managing director at Posterscope, said: "General Motors has a great heritage in out-of-home media, so I'm delighted that Posterscope is part of the team that will be working with such a major advertiser."