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.
More top news
The flame-haired prince told youngsters in Africa he did not enjoy Eton and is "much cooler" than his older brother.
Some Scottish social media users were left confused when Facebook offered them a Romanian flag, not a Saltire, to mark St Andrew's Day.
Ex-detectives Michael Stokes and Stephen Phillips were jailed for two years for stealing money they thought belonged to a drug dealer.