Six minutes in May: how Churchill unexpectedly became prime minister

London, early May 1940: Britain is on the brink of war and Neville Chamberlain's government is about to fall.

It is hard for us to imagine the Second World War without Winston Churchill taking over at the helm, but in this work Nicholas Shakespeare shows how easily events could have gone in a different direction.

The first land battle of the war was fought in the far north, in Norway.

It went disastrously for the Allies and many blamed Churchill.

Yet weeks later he would rise to the most powerful post in the country, overtaking Chamberlain and the favourite to succeed him, Lord Halifax.

It took just six minutes for MPs to cast the votes that brought down Chamberlain.

Shakespeare shows us both the dramatic action on the battlefield in Norway and the machinations and personal relationships in Westminster that led up to this crucial point.