Greenpeace has launched a competition that invites designers and artists to redesign BP’s logo to "better reflect the company’s operations abroad".

Greenpeace says the winning logo will be used in "innovative and confrontational" ways as part of an ongoing international campaign against the oil company. This morning, trained climbers scaled a balcony above the front entrance to BP’s London HQ to hang a giant flag bearing a specially designed, oil soaked BP logo as an indication of what the winner might expect.

To announce the competition, Greenpeace last night projected the words “Your logo here” on giant fuel storage tanks in the refinery which supplies BP in South East England.

The focus of Greenpeace's campaign is BP's plan toi extract oil from the tar sands of Canada, a process that the campaign group says releases even more carbon dioxide than drilling for regular oil.

The contest will run for six weeks, ending on Monday 28th June. The winning logo will feature throughout the campaign and Greenpeace says it will be used in several high profile, iconic locations as well as a further national newspaper advert.

Other prizes include a day of training on a Greenpeace speedboat, a design masterclass with top agency Airside, or one of 50 specially designed Greenpeace goody bags.

There are three categories, aimed at professional designer, general public and the under 16s. The winner will be judged by a panel of experts from the design community.