Honey made from bees in The Duchess of Cornwall's garden has sold out at Fortnum & Mason.

Camilla, The Duchess of Cornwall

Camilla, The Duchess of Cornwall

The 70-year-old royal and her husband Prince Charles, 69, have helped make money for The Silver Line - a helpline for older people - after their flying insects produced plenty of the sweet substance to make up jars of honey at the London department store.

A tweet on the official Clarence House Twitter account read: "Honey made by bees in The Duchess of Cornwall's Wiltshire garden has sold out at @Fortnums, with proceeds going to the charity @TheSilverLineUK. (sic)"

This comes after it was revealed last summer that Charles and Camilla's bees produce 40lbs of honey a year, and the couple urged people to visit their impressive collection of 90,000 insects.

A series of posts on the official Clarence House Twitter account read: "If you visit Clarence House during the summer opening this month, you may spot these beehives in the Royal residence's garden!

"The Clarence House garden contains two beehives, which are home to over 90,000 bees. They produce around 40 pounds of honey a year. (sic)"

Charles is known to be a big fan of bees and has some on his Duchy Home Farm estate, an organic farm which is part of the gardens at his Highgrove House country home in Tetbury, south west England.

Those bees produce honey for the Highgrove Home Farm Runny Honey sold on the Royal Gardens at Highgrove's online shop for £6.50 each.

The sales pitch reads: "A delicious raw runny honey produced by bees on HRH The Prince of Wales's Duchy Home Farm.

"Made in small quantities to traditional methods, this honey is presented in a rustic-style jar, finished with a Highgrove label."