A young girl is shown in close-up blowing out candles on a birthday cake, playing dress-up and asleep peacefully in a car. Then the images become darker, showing disruption, chaos, bombs and panic as Britain descends into a Syria-type conflict and the girl and her family are forced to flee their home in fear.
The images are from a startling new Save The Children campaign that imagines what London would be like if plunged into a conflict similar to that in Syria.
The one-and-a-half minute video was launched in the run-up to the three-year anniversary of the conflict, in which, to date, 10,000 children have lost their lives and 2.3 million people have become refugees.
It closes with the words: "Just because it isn't happening here, doesn't mean it isn't happening."
"We hope the video will resonate with members of the public, particularly those who don’t know much about the situation in Syria so they can really understand the plight of innocent Syrian children. said Jake Lundi, Director of Brand and Communications at Save The Children. "The message to the public is just because it’s not happening here, doesn’t mean it’s not happening."
The conflict has caused a huge humanitarian crisis in the country. Last month, the United Nations Security Council called for both the Assad regime and opposition forces to provide immediate access to deliver aid to millions in need of help.
UN Secretary-General Ban Ki-moon said at the time: "Half the country's people need urgent assistance. Host countries need support in caring for more than 2.5 million refugees."
He described as "profoundly shocking" the fact that "both sides are besieging civilians as a tactic of war".
"Some 200,000 people are under siege in government-controlled areas – and 45,000 in opposition-controlled areas," he added.
In pictures: Syria's escalating refugee crisis
In pictures: Syria's escalating refugee crisis
1/20 Syria refugee crisis
A young Syrian refugee stands near jerry cans used to collect water at Al-Zaatri refugee camp in the Jordanian city of Mafraq, near the border with Syria. The United Nations hopes that political talks between the warring sides in Syria will clinch local ceasefires to allow vital food and medicines to reach millions of civilians
2/20 Syria refugee crisis
Syrian refugees transport small stones for their tents at Al Zaatari refugee camp in the Jordanian city of Mafraq, near the border with Syria
3/20 Syria refugee crisis
Representatives of Syrian President Bashar al-Assad, a deeply divided opposition, world powers and regional bodies started a long-delayed peace conference aimed at bringing an end to a nearly three-year civil war
4/20 Syria refugee crisis
A Syrian refugee family rests inside their shelter in Hatay, Turkey
5/20 Syria refugee crisis
A Syrian refugee family from Aleppo crosses the Bosphorus from Uskudar to the European side of Istanbul
6/20 Syria refugee crisis
Syria's air force struck rebel-held areas around Damascus and Aleppo as face-to-face peace talks tentatively began in Switzerland
7/20 Syria refugee crisis
Syrian refugees look out from an evacuated house in the Kucukpazar district of Istanbul. Syrians fill houses which have been evacuated for urban development projects. Destitute Syrian refugees who have fled the war in Syria and camps in Turkey are fighting for their lives in different parts of Istanbul
8/20 Syria refugee crisis
Refugees who moved into the houses in Kucukpazar neighbourhood near the historic Suleymaniye mosque, are struggling to live without water and heating
9/20 Syria refugee crisis
A Syrian woman and her child stand inside a building in the Kucukpazar district of Istanbul
10/20 Syria refugee crisis
A Syrian boy sits in debris in the Kucukpazar district of Istanbul
11/20 Syria refugee crisis
Damaged buildings line a street in the besieged area of Homs
12/20 Syria refugee crisis
People sit around a fire along a street lined with debris in the besieged area of Homs
13/20 Syria refugee crisis
Children cut wood pieces in the besieged area of Homs. Efforts to get food and medical aid into Homs have become a test case on whether peace talks in Switzerland can produce any practical results almost three years into the Syrian conflict
14/20 Syria refugee crisis
Boys walk along a street past damaged buildings and vehicles in the besieged area of Homs
15/20 Syria refugee crisis
Syrians stand in a destroyed street following a reported airstrike by government forces on the northern Syrian city of Aleppo
16/20 Syria refugee crisis
Rescue teams search for survivors on the rubble of a building following Syrian government air raids in the northern Syrian city of Aleppo
17/20 Syria refugee crisis
A graveyard in the northern Syrian city of Aleppo
18/20 Syria refugee crisis
A view of destruction in Aleppo's ancient Umayyad mosque, in the UNESCO-listed northern Syrian city. The mosque's minaret was blown up during clashes between opposition and government forces
19/20 Syria refugee crisis
Syrians attend the funeral of victims who reportedly died of hunger in the besieged Yarmuk Palestinian refugee camp in southern Damascus
20/20 Syria refugee crisis
A man holds the corpse of one-year old baby Adbul Jalil Mohamed Hamis wrapped in shrouds, who reportedly died of hunger in the besieged Yarmuk Palestinian refugee camp in southern Damascus during a funeral ceremony
UN humanitarian chief Baroness Amos has described progress on delivering aid to those most in need as "limited, uneven and painfully slow".
She said last month: "It is vital that ordinary people, who have been bearing the brunt of the violence, are protected. More than anything, the conflict needs to end so that people can begin to rebuild their lives. Syria is in danger of losing a generation of its children. Children are the future. We must protect them.