The man who would be king, eventually: Prince Charles turns 70

Life of luxury?

Official figures show his recent overseas tours were the most expensive taken by the royals.

"He's ... intent on a very, very hyper-luxurious way of life, flying by private jet, (using the) royal train," said Bower, whose says his book was based on interviews with 120 people, many of whom worked for the royals.

Charles rejects such claims.

"Oh, don't believe all that crap," he told an Australian radio station in April when asked if it was true he travelled with his own toilet seat as Bower described.

But he can still put on a regal show: If he entertains, there is beautiful food, wine and service.

"He thinks that's right for the Prince of Wales and I think people would be disappointed if it wasn't," the ex-aide said.