Theresa May is holding a series of bilateral meetings with world leaders at today's event.

Downing Street confirmed the prime minister has already met her Polish counterpart, Mateusz Morawiecki, and is due to have talks with French President Emmanuel Macron, Australian Prime Minister Scott Morrison and Canada's Justin Trudeau.

"The main theme of the talks today is about shared security," a Downing Street spokeswoman said.

Image source, Reuters

BBC Radio 5 Live

BBC Radio 5 live presenter Nicky Campbell spoke to his mum Sheila Locke - later Sheila Campbell - about D-Day. She was a radar operator, stationed in a mobile unit on Beachy Head in East Sussex.

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Sergeant John Jenkins MBE, 99, from Portsmouth, was in the Pioneer Corps on D-Day and landed on Gold Beach on 8 June.

Joking about his age and drawing laughs from the crowd, he continues: "I was 23 years old when I landed on Gold Beach. I was terrified, I think everyone was. I look back on it as a big part of my life. I was just a small part in a very big machine."

He says he is "honoured" to be at the service along with other D-Day veterans.

"You never forget your comrades because we were all in it together," he says.

"It is right that the courage and sacrifice of so many is being honoured 75 years on.

"We must never forget."

As Sheridan Smith was hitting another high note, many eyes were on the skies to see today's flyover.

In addition to helicopters, it included:

• Spitfires - fighter
• Hurricane - fighter

• C-130s - transport aircraft
• Sentinels - ground surveillance vehicle
• Voyager - Royal Air Force's largest aircraft
• Hawks - fighter jets
• Typhoons - interceptors
• It all ended with a display by the RAF's Red Arrows

The Queen enjoys an animated conversation with veterans after the ceremony ends.

She was 13 when World War Two broke out.

She is joined behind the scenes by Prince Charles, President Trump and First Lady Melania.

A minute's silence has been held at a war memorial near Guildhall Square.

Anti-Trump protesters and members of the public paid tribute to those who took part in the D-Day operation.

A wreath was also laid.

The actress returns to the stage to perform another Vera Lynn hit, We'll Meet Again.

Earlier this week, the singer wrote on Twitter to say: "My dad would have been so proud."

The Queen continues thanking veterans: "In a broadcast to the nation at that time, my father King George VI said: 'What is demanded from us all is something more than courage and endurance. We need a revival of spirit. A new unconquerable resolve.'

"That is exactly what those brave men brought to the battle, as the fate of the world depended on their success.

"Many of them would never return, and the heroism, courage and sacrifice of those who lost their lives will never be forgotten.

"It is with humility and pleasure, on behalf of the entire country, indeed the whole free world, that I say to you all, thank you."

The Queen is speaking now: "When I attended the commemoration of the 60th anniversary of the D-Day landings, some thought it might be the last such event.

"But the wartime generation, my generation, is resilient and I'm delighted to be with you in Portsmouth today."

General Sir Nicholas Carter praises British industry for designing and producing what was needed for the front line.

"Above all", he says, "D-Day was a truly national and multi-national endeavour."

Thousands of people have turned out on Southsea Common to join in today’s D-Day commemoration.

Members of the public are separated from the VIPs and veterans by a large security fence, but are able to watch the ceremony on a number of big screens.

British baritone Sir Willard White belts out Le Chant des Partisans.

The song was popular among members of the French Resistance and those in unoccupied France.

The memories of a Royal Navy electrician R G Watts, as he left Southampton to Normandy in June 1944, are read to the crowd.

"The troop landing craft was packed to full capacity. There was no cover for the Army, just standing or sitting, exposed to the elements.

"The weather conditions were atrocious.

"I estimate that 90% of the soldiers were extremely sea sick. Just holding on to anything to hand.

"All that training for fitness, but now old Mother Nature was laughing at us. The stench of diesel oil and vomit all over the deck became a situation one would not forget in a hurry."

More from the letter, read by Theresa May, by Captain N W G Skinner, of the Royal Army Service Corp.

Writing to his wife two days before the D-Day landings, he says: "My darling, this is a very difficult letter for me to write.

"I'm sure that anyone with imagination must dislike the thought of what's coming.

"But my fears will be more of being afraid than of what can happen to me. You and I have had some lovely years which now seem to have passed at lightning speed.

"Although I would give anything to be back with you, I have not yet had any wish at all to back down from the job we have to do."

The story of British spy Yvonne Cormeau is told to the crowd.

After her husband was killed in 1940, Ms Cormeau volunteered for the Women's Auxiliary Air Force before being signed up for continental espionage.

In her own words, we hear how she was parachuted into France, regularly hid in villages and was shot at by the Gestapo.

Cormeau describes her closest brush with death when she was ordered into a ditch by a German soldier who drew his pistol - but she escaped thanks to her fluent German and a fluke of language.

She spent 13 months and two days in occupied France.