British movie where Sandra oh gets shot near the end

A security consultant hunts for a ruthless assassin. Equally obsessed with each other, they go head to head in an epic game of cat-and-mouse.

In the 1970s, a member of the IRA takes over an Active Service Unit in London after his wife is accidentally shot dead in Ireland. The unit's mission is to cause chaos and destruction, while his personal aim is to hunt down his wife’s killer — an SAS captain, who is also hunting him.