Embargoed to 0001 Tuesday June 25 File photo dated 26/03/19 of the Prince of Wales and the Duchess of Cornwall sitting on the John Lennon memorial bench in John Lennon Square, Havana, Cuba, as part of an historic trip which celebrates cultural ties between the UK and the Communist state. The cost of the Prince of Wales and the Duchess of Cornwall's official travel by air and rail rose by almost a third (31%) in 2018-2019 - jumping from ??1.01 million to ??1.33 million.