DAVID CAMERON faced calls yesterday to come clean over the extent of Britain’s secretive role in Yemen’s bloody civil war.

SNP Westminster leader Angus Robertson pressed the Prime Minister to admit that Britain was “effectively taking part in a war” without the support of Parliament.

Amnesty International revealed this week that the British government granted £1 billion worth of arms export licences for Saudi Arabia, which leads a coalition that is bombing Yemen in support of its ousted president Abed Rabbo Mansour Hadi.