The dress was first worn by the Queen during the opening of Parliament in the early 1960s.

Roughly 20 people attended the ceremony in accordance with 'government guidelines' due to COVID-19, Buckingham Palace confirmed.

'There is no way that we can move forward unless we acknowledge the past,' Prince Harry says in the video.

"I'm very impressed by what you have achieved already," the Queen says in the video chat.

The Duke of Edinburgh has lived quite a life, from his long navy career to his long marriage to the Queen of England.

The video message features a rare audio clip from the Queen herself.

The Queen was only 19 when her father made his landmark address over seven decades ago.

The British monarch will ring in her 94th year at Windsor Castle, where she is in isolation with Prince Philip.

The message comes days after the Queen announced a number of changes to her personal schedule during the COVID-19 outbreak.

Many of the Royal Family's typical events have been cancelled due to the COVID-19 outbreak.