About 1,500 people gathered at St Paul's Cathedral in London
The fire, on 14 June, claimed 71 lives
The Prince of Wales, Duke and Duchess of Cambridge and Prince Harry joined the bereaved, survivors and rescue workers
The service was held to remember the victims and give thanks to emergency workers
Prime Minister Theresa May, Labour leader Jeremy Corbyn and the Archbishop of Canterbury also attended
Royal family members met families affected by the fire after the service
The graphic does not include Victoria King, 71, and her daughter Alexander Atala, 40, who also died in the blaze. Details of where they lived have not been released.
Members of the Ebony Steel Band, some of whom live near Grenfell Tower, play "Hallelujah" by Leonard Cohen.
A viewer tweets in her thoughts from home.
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Reverend Alan Everett, of St Clement and St James in North Kensington, said he prayed for "all who are scarred by the horrors of the fateful night".
"May all our memories be healed".
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Emergency services were called to the fire at the block of flats in the borough of Kensington and Chelsea just before 01:00 BST on Wednesday 14 June.
The fire is believed to have started on the fourth floor and spread quickly.
Image source, BBC/Getty ImagesA total of 65 people were rescued from the building by firefighters. Some residents appear to have moved to the upper floors to escape the flames, only to become trapped in the flats of friends and neighbours. Twenty-one people died on the top floor of the tower block.
The blaze was not brought under control until 01:14 BST on Thursday - 24 hours later.
Read a visual guide to what happened here.
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Professor Chris Imafidon says he knows of 20 people who were made homeless by the Grenfell fire and have been let down by the local authority.
He said: "It is a very sad day. But the families want a service from the council, not a church service.
"This is just a big distraction from the fact that six months on - many families are still homeless and will be spending Christmas in a hotel."
The Bishop of Kensington tells the congregation is "time to learn to listen and to love".
Dr Graham Tomlin says the memorial is an assurance to families and those most deeply affected by this tragedy that they are "not forgotten" by the nation.
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Image source, EPATen adults and five children lived on the 21st floor of Grenfell Tower.
Nine of them survived the fire, but six - and one unborn baby - perished.
Find out about their lives in the tower and their experiences of the night of the blaze here.
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The Bishop of Kensington recalls a story from the days after the fire.
Dr Graham Tomlin says he was approached by six-year-old Alfie who wanted to give his pocket money to those who had lost their homes as a result of the disaster.
He says the reaction and support of the community and the country offered a "glimpse of what society could be like".
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Dr Graham Tomlin, Bishop of Kensington, said there were still "far too many" survivors living in hotels and "living with uncertainty".
"The evening of 13 June was an evening like any other in London," he said. "It had been a hot day and the sun went down on a calm and gentle night.
"Yet that night was to change the lives of so many. Since then, it has been a long six months. Many still struggle with their memories."
But he said the aftermath saw "something extraordinary" as people from across the capital came to help.
"We saw acts of simple but remarkable generosity," added Dr Tomlin.
Victoria Derbyshire
The Victoria Derbyshire programme's reporter Jim Reed looks at the key moments as the fire spread.
A choir from an Islamic faith school are now singing a song called "Inshallah" - the Arabic phrase for "God Willing". The choir is made up of 30 girls, all aged between nine and 11.
Seventy-one people died when the fire engulfed Grenfell Tower in the early hours of 14 June.
Learn more about them here.