Award-winning journalist Mark McFadden takes a trip along the 300-mile border between Northern Ireland and the Republic of Ireland to find out why it has become such a crucial sticking-point in the Brexit negotiations. Mark, who has lived on the border his whole life, meets those who live on both sides of the border, many of whom cross several times a day for work and pleasure.

With the Government recently announcing ambitious plans to keep Britain a world military leader, Tonight explores if our armed forces really are ready for combat should global tensions escalate. As the nature of modern warfare evolves and as recruitment and funding issues mount, Tom Bradby asks how prepared we are to fight.