By Deborah Haynes, security and defence editor
The prime minister of a fictional British government is preparing to deliver an address to the nation after the UK came under armed attack from Russia in the latest episode of The Wargame podcast.
Were this happening for real, it would mark the most significant public broadcast by any British leader since the Second World War.
"Am I actually going to do it?" Sir Ben Wallace asks, breaking briefly from character in the new podcast series by Sky News and Tortoise.
The former Conservative defence secretary is playing the part of the prime minister, leading a team of fellow former top politicians and military and security chiefs in the scenario.
Listen to episode three of The Wargame...