Theresa May flies to Saudi Arabia tomorrow on the second leg of her tour of Arab states.On the agenda will be discussions on counter terrorism and boosting trade with the kingdom. But her trip comes as the Metropolitan Police revealed its war crimes unit is examining allegations of war crimes by Saudi Arabia in their bombing campaign in Yemen.

Human rights activists attempted to carry out a citizen’s arrest of Saudi Major General Ahmed al-Asiri in Britain last week, which this programme has obtained exclusive footage of.

Activists attempt citizen’s arrest of Saudi general