The 96-year-old is believed to have recovered enough to attend grandson Prince Harry and Meghan Markle's wedding.
Frail Prince Philip gets back behind the wheel for first public appearance since leaving hospital after hip surgery
Prince Philip took a Land Rover for a spin and chatted with the Queen as he made his first appearance in public since leaving hospital after a hip replacement operation - writes mirror.co.uk
The recovering 96-year-old royal drove to the Royal Windsor Horse Show at Windsor Castle, the summer retreat where his grandson Prince Harry will wed Meghan Markle .
Philip, appearing frail and thin, was photographed casually dressed and sat at the wheel of the 4x4 as he talked to his wife the Queen through the vehicle's open window.
The former naval officer's appearance is likely to be interpreted as confirmation he has recovered enough to attend Harry, 33, and Meghan, 36, wedding next week.
The Duke of Edinburgh underwent the hip operation at the private King Edward VII hospital in London on April 4.
He and the Queen, 92, spent part of Friday at the horsejumping competition, which is celebrating its 75th year and is held annually on the Berkshire castle's grounds.
They were accompanied by Penny, Countess Mountbatten of Burma, as Philip drove a black Land Rover.
The Royal Windsor Horse Show - which began Wednesday and ends Sunday - is one of the Queen's favourite events of the year.
Planners have carefully timetabled to event to ensure preparations for Harry and Meghan's wedding, which will be held at the castle's gothic St George's Chapel, will not be affected.
Philip retired from public life in August last year, quipping at the time that he was no longer able to "stand up much".
It had been reported that Philip was believed to have ditched his crutches following the hip operation and would watch his grandson tie the knot with the US actress on May 19.
There were fears he would miss the big day due to his health.
Kensington Palace said on May 4 that Harry would be supported at the ceremony by his grandmother the Queen, his dad Prince Charles and his brother Prince William, who is his best man.
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