Full coverage of the commemorations marking 100 years since the Battle of the Somme
The Battle of the Somme was fought between 1 July and 18 November 1916, with over a million British, French and German casualties
1 July 1916 remains the bloodiest day in British military history with 57,470 casualties, 19,240 of whom were killed
The centenary was marked by a national two minutes' silence at 07:28 on 1 July, the moment soldiers went over the top
Let us know about your commemorations using #Somme100
By Lauren Turner, Suzanne Leigh, Ruth Levis, James Percy, Alex Kleiderman and Peter Harvey
All times stated are UK
We will remember them
That's all for our live coverage of the national remembrance of the Battle of the Somme. Thanks for following our updates and for sharing your commemorations with us online.
To find out more about the BBC's World War One coverage, go to bbc.co.uk/ww1
The battle of the Somme remembered
The battle of the Somme has defined our idea of the First World War. On the first day alone, 19,240 British soldiers lost their lives. The Somme campaign wore on for five months and, in all, more than a million soldiers from the British, German and French armies were wounded or killed. The British army advanced just seven miles.
For future generations, the battle became a symbol of the futility of war.
James Heffer was just 16 when World War One broke out, and by June 2015 he was in the trenches as part of The Cambridgeshire Regiment.His son, the journalist Simon Heffer, explains how his father ended up fighting at such a young age.
He also reads some extracts from James' diary, written as the Battle of the Somme commenced.
How WW1 changed the way we bury our war dead
In 1918 Fabian Ware, the Vice Chairman of the Imperial War Graves Commission, sent out a report setting out the plans for the WW1 cemeteries and monuments.
Volunteers in World War One uniforms were not confined to the UK. This photograph of men paying their respects while dressed in the 1916 colours of the French Army was taken during the service at the Thiepval Memorial in the Somme.
Getty ImagesCopyright: Getty Images
Camilla visits great uncle's grave
The Duchess of Cornwall has laid a wreath at the grave of a great uncle who was killed during the Battle of the Somme while serving with the Coldstream Guards.
It was the first time Camilla, accompanied by the Prince of Wales, had visited Carnoy Military Cemetery, where Cpt Harry Cubitt is buried.
He was the eldest of three sons killed during the war and the duchess told reporters a photograph had been placed beside the grave, although she did not know who left it.
"I have never seen a photograph of him before," she said.
"It is such a long time ago and it made me suddenly realise what it must have been like for my great grandparents, to have three sons within 18 months of one another being killed."
Commuters moved to tears by 'ghost soldiers'
The haunting image of thousands of men dressed as WW1 soldiers across the UK on Friday's centenary anniversary has produced an emotional response from those who've witnessed the commemorative journeys.
Moving UK-wide art event honours fallen Somme soldiers
Commuters across the UK were stopped in their tracks on Friday morning as thousands of volunteers dressed in First World War uniforms took part in a unique event to mark the centenary of the Battle of the Somme, organised by Turner Prize-winning artist Jeremy Deller in collaboration with National Theatre director Rufus Norris.
Handing out cards with the names of the fallen, the "ghost soldiers" were seen at train stations, high streets and thoroughfares, with hundreds of people uploading photos to social media along with the hashtag #wearehere.
Radio 4's PM put together a montage of voices from the BBC series The Great War. People from both sides remember the grim realities of the conflict.
The British gain some ground
History of World War One
By the end of the day the British had gained just three square miles of territory.
On the right wing of the Fourth Army forward trenches were captured. Across the rest of the line the battle was a disaster for the British, with the exception of the Ulster Division which was holding the Schwaben Redoubt. The French forces managed to gain land up to the German second line.
The British forces suffered 57,470 casualties, including 19,240 fatalities.
In the vaulted chapel of Old St Pauls Episcopal Church in Edinburgh is a war memorial from where this evening's epitaph is recorded. The church is hidden down a close, in what was once the heart of Edinburgh’s old town slums. It gave up many of its men to the local regiments – five of them died on 1 July 1916 alone.
In the 16th Royal Scots McCrae’s battalion were: David Newton Smart, the eldest of three brothers to die in the war, Edward Anderson, the 19-year-old son of a type founder, and William Tait, a plumber’s apprentice. In the 15th Royal Scots: John Rosenbluth the son of a Russian book binder and William Arthur Hole, the son of the artist William Hole who made the frieze in the entrance hall of the Scottish National Portrait Gallery.
The clip includes an interview between Cathy MacDonald and Professor Sir Hew Strachan of St Andrews University.
Nature, soldiers and the Somme
Frank Gardner is the BBC's security correspondent, and a keen birder. Earlier this year, he travelled to France to document the therapeutic role that nature played in the trenches.
Song for the Lapwing
And listen to Frank Gardner read a poem written by a soldier standing on guard duty in the trenches, watching the lapwings fly above him and wishing he could join them on their journey back to the green fields of Kent. British folk group The Young'uns, on location on the Somme, perform their interpretation of the piece.
World War One at home
How did the war affect people at home? Read fascinating stories that show how World War One changed the people and places of the UK and Ireland.
Brian Cox narrates the final short episode telling the stories of Scottish troops on the first day of the Battle of the Somme. This piece tells the tale of a medical officer and the 17-year-old private from Clydebank who lied about his age, taken from Captain (later Major) Duncan Pailthorpe's memoirs of the day.
(Courtesy of the Gordon Highlanders Museum.)
A masterpiece reimagined
Hailed as a masterpiece of 20th Century literature by the likes of WB Yeats, David Jones' epic poem In Parenthesis recounts the horrors of the Battle of Somme from a Welsh perspective - and all mixed in with a fair dash of Celtic mythology.
Adapted for the stage by Welsh National Opera, this new production, thanks to collaboration with The Space, will now be available for all to view online, streamed from the Royal Opera House from 19:00 BST tonight.
At Westminster Abbey on Thursday evening, students and teachers from 16 schools across the country kept vigil at the Tomb of the Unknown Warrior, each one held in the memory of individuals who played their part 100 years ago.
The vigils took place throughout the night ending at 07:30 BST - the moment the soldiers went over the top on the first day of the Battle of the Somme.