Don't call William "mate"

It seems there are limits on the informality of Royal visits - the Herald on Sunday reports:

Republican Movement of Aotearoa New Zealand chairman Lewis Holden dismissed the comments as a public relations stunt to promote William over his less popular father, Prince Charles.

And he said any attempt to make the monarchy appear more modern could backfire.

"If you take away all the things that are old-fashioned about the monarchy it takes away the things that people like about it."

However, Monarchy New Zealand Chairman Noel Cox warned against against calling Prince William "mate", that would be too informal. He plans to call him "sir" if he gets to meet him.