Commemorations across the BBC for the Centenary of the Battle of the Somme begin with The Vigil.
Huw Edwards in Thiepval, France, and Kirsty Young in Westminster Abbey, London, provide live coverage of vigil services held to commemorate the centenary of the Battle of the Somme. One hundred years on from the eve of this battle, commemorations begin at Westminster Abbey, where Her Majesty the Queen and the Duke of Edinburgh lead the nation's remembrance at the Grave of the Unknown Warrior.
Immediately after, TRH The Duke and Duchess of Cambridge and HRH Prince Henry of Wales attend a vigil service at The Thiepval Memorial in France. The memorial bears the names of more than 72,000 men who died on the Somme and have no known grave.
Vigils are held in Scotland, Wales and Northern Ireland as communities across the nation come together to remember all those lost at the Somme.