His father's best friend is the Duke of Beaufort, while one of his sisters is a countess and the other a marchioness – not to mention a Norfolk neighbour and great chum of the Prince and Princess of Wales.

But the most junior member of the remarkable Hanburys will soon boast a familiarity with the palaces of Europe which will eclipse the combined knowledge of them all.

I can disclose that in the frenzied run-up to Christmas, David Hanbury, 39, youngest of Tim and Emma Hanbury's three offspring, married at the Grosvenor Chapel in London's Mayfair – setting for the opening of Richard Curtis's 2003 romcom Love Actually.

But, star-studded though Curtis's flick was, it lacked one ingredient – royalty. There was no such deficiency at David's wedding to Anouska d'Abo, a boss at SXSW music and film festival. 

Among the guests and radiating a glamour few could match – other, perhaps, than David's sisters, Marina, wife of the Earl of Durham, and Rose, married to the Marquess of Cholmondeley – was Princess Madeleine of Sweden.

The younger daughter of King Carl Gustav, Madeleine, 43, is 34-year-old Anouska's aunt. Their connection is by marriage, Princess Madeleine having married Anouska's uncle, financier Christopher O'Neill, in 2013.

David Hanbury married Anouska d'Abo at the Grosvenor Chapel in London's Mayfair – setting for the opening of Richard Curtis's 2003 romcom Love Actually

Among the guests was Princess Madeleine of Sweden (right), Anouska's aunt, pictured here at the 2018 christening of Madeleine's daughter, Adrienne

Five years later, the royal couple made Anouska godmother to their second daughter, Adrienne. The christening was held in the chapel at Drottningholm Palace, whose grandeur matches Buckingham Palace.

Not that it will daunt David, an Old Etonian like his father. 

After notching up a First in engineering science at Oxford, he bagged another in data science at London University, and is now founder and chief executive of Deep Medical, which aims to 'eliminate the NHS backlog [by] using AI to predict missed appointments'.

Perhaps, in his spare time, he can unleash it on assessing the comings and goings of princes – whether in California or closer to home.

How Winslet tamed a very grumpy dame

Dame Helen Mirren agreed to star in her friend Kate Winslet's directorial debut Goodbye June, but the Oscar-winner could apparently prove challenging when arriving for filming.

'The way that she kind of managed herself, really, was that she didn't actually want to talk about anything until we got there on the day,' Winslet explains.