TheBritish Royal Familyknows that both its success and longevity depend on public approval.

“Kate and William are totally different and operate in a totally different way.

They’re great,” he toldExpress.

Kate Middleton and Prince William

“It’s the best thing the Royal Family could have.”

However, the outlet notes, Gavin doesn’t think they compare to the fabulous Princess Diana.

“There will never be another Diana,” he explains.

Kate Middleton