To their friends they are simply Luke and Julie Montagu, a likeable, professional couple from London in Australia for a working holiday with their young family doing the usual stuff: snorkelling on the reef and catching the sights of Sydney.

Oh, and American born and raised Julie is something of a yoga and wellness celebrity in her adopted Britain. She's also here promoting a new range of gluten-free wraps called BFree..

Luke Montagu, Earl of Sandwich and his wife Julie. Credit:James Brickwood

So, not much to report? Well, not quite.

They are also British aristocracy, the Viscount and Viscountess Hinchingbrooke, a centuries' old hereditary title which will one day see Luke Montagu become the 12th Earl of Sandwich. Julie will then be the Countess of Sandwich.