The Royal Barge Gloriana is joining eight other vessels for the 'Royal River Salute' as part of commemorations on the day The Queen becomes Britain's longest-ever serving monarch.
Gloriana will be joined by police, fire, RNLI and commercial boats as part of the procession along the Thames from Tower Bridge to the Houses of Parliament.
HMS Belfast will also fire a 4-gun salute as the boats pass by.
The Queen has halted her journey on the new Scottish Borders Railway to meet well-wishers at Newtongrange in Midlothian.
The luxury steam locomotive, Union of South Africa, transporting the royal party is bound for the town of Tweedbank, where the opening ceremony of the £294 million railway will be held.
As the nation marks the occasion The Queen becomes the UK's longest reigning monarch, we take a look at some of the numbers behind her rule.Read the full story ›
Prime Minister David Cameron has paid fulsome tribute to the Queen on the day she becomes Britain's longest running monarch, describing her reign as a "golden thread running through three post-war generations".
Speaking in the House of Commons, Mr Cameron said: "I do think it's right that today we should stop and take a moment as a nation to stop and mark this historic milestone."
Her Majesty the Queen inspires us all with her remarkable service, her dignified leadership and the extraordinary grace with which she carries out her duties.
It is truly humbling to comprehend the scale of service that Her Majesty the Queen has given this country. The reign of Queen Elizabeth II has been a golden thread running through three post-war generations.
The Queen is our Queen and we couldn't be more proud of her. She has served this country with unerring grace, dignity and decency. And long may she continue to do so.
Her Majesty has arrived at Edinburgh Waverley station where she boarded a train to Tweedbank where she is expected to make a speech on the day she becomes the longest reigning British monarch.
The Queen is en route to Edinburgh Waverley Station to board a train with Scotland's First Minister Nicola Sturgeon that will head to the Borders town of Tweedbank where Her Majesty will officially open the new rail route.
Former prime minister Sir John Major has paid tribute to the Queen as an "absolute constant" in British public life.
Her Majesty will today surpass her great-great-grandmother Queen Victoria as Britain's longest reigning monarch after inheriting the throne in 1952.
Throughout the last 60 or so years, the Queen has been an absolute constant.
Whilst prime ministers have come and gone, celebrities have come and gone, life has changed, she and the monarchy have been an absolute constant in their lives and I think that is very reassuring.
The Duchess of Cornwall is visiting ITV studios in London as part of the network's 60th anniversary celebrations.
ITV News' Vincent McAviney has tweeted these images:
The Duchess inspects the ITV 60 cakes, Victoria sponge because of the day, she says she wants to stick her finger in http://t.co/jrJ95x54iU
Camilla toured the newly refurbished ITV riverside studios at Waterloo, meeting presenters and staff from This Morning, Good Morning Britain and Loose Women to mark the anniversary.
Duchess of Cornwall has turned down an invite to join the Loose Women panel but asked Holly W about her young baby http://t.co/0e6vUZYe62
Royalists in Scotland have begun gathering in readiness for the arrival of the Queen on the day she becomes Britain's longest reigning monarch.
Her Majesty has halted her holiday in Balmoral to open the new £294 million Scottish Borders Railway amid widespread celebrations for her own milestone.
To mark Queen Elizabeth II's record reign, ITV News has spoken to three people who have come to know Her Majesty in a very personal way.Read the full story ›