They're not exactly regular tube users, so commuters were rather surprised to see Prince Charles and The Duchess of Cornwall underground this morning. The Royal couple swiped in using their own oyster cards, like the rest of us, but their journey was anything but average, as Rags Martel reports.
Today's journey was the first ever joint tube trip for Prince Charles and the Duchess of Cornwall.
Although both of them now qualify for an over-60s Freedom Pass, they were presented with commemorative Oyster cards topped up with £10 credit for the one stop journey from Farringdon to King's Cross.
A brand new train was used, which arrived at the platform empty. But members of the public boarded along with the royal couple - separated only by a group of policemen standing further down the carriage.
When the royal couple arrived at King's Cross they were taken to "Platform nine and three quarters", a Harry-Potter themed attraction in the station.
In the books by JK Rowling, the "Hogwarts Express" steam train leaves from a secret platform, which witches and wizards reach by pushing a trolley through a wall.
But Charles and Camilla remained firmly in the land of the "muggles" or non-wizards.
After the royal couple's trip on the Metropolitan Line, Clarence House tweeted this picture of the Duchess of Cornwall at "Platform 9 3/4" at King's Cross station.
Clarence House has tweeted pictures of Prince Charles using an Oyster card to pass through the ticket gates at Farringdon Station.
The Prince of Wales and the Duchess of Cornwall are visiting the station to mark the 150th birthday of the tube.
The royal couple were presented with special commemorative Oyster cards.
The Prince of Wales has been to a sports shop in St John's Wood today.
He was there in his role as president of Business in the Community, a charity which encourages companies to be more community-minded.
The main priority of the store is to get local young people who aren't in employment, education or training into permanent jobs and apprenticeships.
The heroes of Britain's armed forces were saluted at an awards ceremony at the Imperial War Museum last night.
The 'Millies', as they are known, recognise extraordinary people and their remarkable achievements.
The Prince of Wales will return today to a community badly hit by the riots which rocked London and other cities last year.
Charles and the Duchess of Cornwall will visit Croydon, south London, one of the riot-torn areas they visited last year to view the devastation caused by the lawlessness.
They will meet shopkeepers, residents, faith leaders and students to find out how things stand a year later.
Some of the most evocative images of the unrest were of historic furniture shop House of Reeves in Croydon, which was razed by a massive fire, having stood on the site for more than 140 years.