5:38 pm, Thu 23 May 2013
The Prince of Wales greets school children as he and the Duchess of Cornwall arrive at the Hay Festival.
Credit: PA Wire
Despite the unscheduled stop the royal couple transferred to cars and continued on to the market town of Hay-on-Wye by road.
They finally arrived close to three hours late but emerged looking relaxed and smiling to be greeted by a crowd of several hundred well-wishers.
5:32 pm, Thu 23 May 2013
The royal helicopter, carrying the Prince of Wales and Duchess of Cornwall, was forced to make an emergency landing.
Credit: VI Images/Press Association Images
The Prince of Wales and the Duchess of Cornwall had a "hairy experience" when their royal helicopter was forced to make an emergency landing after it developed a technical fault.
Charles and Camilla were flying to Wales for a day-long tour to Hay and its popular annual festival of literature.
But minutes after boarding their flight they were urgently diverted to Denham Aerodrome, in Buckinghamshire.
A spokesman for the royal couple said: "The pilot carried out a controlled emergency landing after diverting to the airport."
"It was quite a hairy experience," a source close to the palace added.