Greenpeace has again delayed a BP-chartered rig from its planned drilling work in the North Sea, as an activist boat blocked the unit in its path for a third time.

The Greenpeace protest, now in its tenth day, is hampering work by the Transocean-owned semi-submersible Paul B Loyd Jr, as it attempts to reach BP’s Vorlich oilfield.

Greenpeace said on Tuesday its activists have forced a third U-turn of the rig, after two rigid hull inflatable boats (Rhibs) were deployed from its Arctic Sunrise ship, with activists on board holding banners reading ‘