‘We’ve made our plan,’ declares a brooding Guy Fawkes, guarding barrels of gunpowder.

‘Now we must see it through.’ Tonight’s finale sees the plotters gather at Westminster ready to carry out their explosive attack.

We know someone will stop them, but with rumours rife that the Catholics have a terrible plan, Spain nervous about diplomatic relations with King James, and Anne worried for her cousin’s soul, who will it be?

Every good schoolchild knows Fawkes was caught, but what about Catesby?

And what were the consequences of the plot?

A brutal and fascinating finale, with a memorable turn from Mark Gatiss as the scheming Robert Cecil.