Semi-naked activists protest against National Portrait Gallery's links with BP

Onlookers applaud as topless protesters from Extinction Rebellion covered in fake oil

Semi-naked environmental campaigners have been drenched in fake oil at the National Portrait Gallery to protest against its sponsorship by BP.

To the surprise of visitors on Sunday afternoon, activists from Extinction Rebellion wearing just underwear suddenly assumed the foetal position while others poured the "oil" on their bodies in the Ondaatje Wing main hall, where a collection of pieces sponsored by BP is on display.