Queen Camilla attended a memorial service at Grosvenor Chapel for her friend Kirstie Allsopp‘s father Charles following his death aged 83.

Charles, who passed away at home on June 5, was the 6th Baron Hindlip, a renowned auctioneer and a member of the House Of Lords.

He was previously the chairman of the iconic Christie’s auction house, and sold pieces including a gown worn by Princess Diana, as well as Vincent Van Gogh’s Sunflowers painting.

His Location, Location, Location star daughter Kirstie, 52, announced his passing earlier this month as she shared an emotional tribute to her father.

Camilla was pictured attending Charles’s memorial service yesterday in Grosvenor Chapel, the Anglican church in the City of Westminster.

The Queen wore a long black dress as she attended without her husband King Charles, who is still undergoing treatment for cancer but has resumed some public duties.

Camilla is a childhood friend of Fiona Atherley, Kirstie’s mother who married Charles in 1668. Fiona died in 2014 aged 66 after living with breast cancer for 25 years.

Queen Camilla attending a memorial service for Charles Allsopp in Grosvenor Chapel yesterday

Kirstie Allsopp, pictured at the memorial, announced the death of her father earlier this month

Charles was the 6th Baron Hindlip, a renowned auctioneer and a member of the House Of Lords

Camilla is godmother to Kirstie’s brother, art dealer Henry Allsopp, and she attended his wedding in 2012 to Naomi Gummer, daughter of David Cameron’s close associate Lord Chadlington.

Paying tribute to her father earlier this month, Kirstie posted a photo of her father Charles and wrote: ‘This is my Dad, Charlie Hindlip. He was a great auctioneer, the best of his generation, an artist, a gardener, a father of four, and grandfather of eight, a loving husband to a wife he lost too soon.

‘He was a real star, he worked hard, played hard and went further than anyone ever expected. He died at home yesterday, surrounded by love, flowers & photographs, in a house he built, looking out over a stunning garden he created from scratch.

‘I have been so proud to be his daughter all my life, and will be until the day I die. Bless you Dad, we loved you so much.’

Among those to also pay tribute was fellow presenter George Clarke, who wrote: ‘I’m so sorry for your loss Kirstie … but what beautiful beautiful words about him. Sending you the biggest hugs and mountains of love. George xxxxx.’

Charles was the former chairman of iconic London auction house Christie’s until his retirement in 2002.

He was also a hereditary peer and businessmen, and a member of the House of Lords from 1993 until 1999, and had previously been educated at Eton College.

Charles married Kirstie’s mother Fiona Atherley, an interior designer, in 1968. The couple had four children together

Charles was a hereditary peer and businessmen, and a member of the House of Lords from 1993 until 1999, and had previously been educated at Eton College

In 1968 Charles married Kirstie’s mother Fiona Atherley, who died in 2014 aged 66 after living with breast cancer for 25 years

In 1968 he married Kirstie’s mother Fiona Atherley, an interior designer, who died in 2014 aged 66 after living with breast cancer for 25 years. The couple had four children together.

In 1997 Charles acted as auctioneer for Princess Diana’s dresses, which raised £2.8million for charity, just two months before her death.

He also conducted the sale of Van Gogh’s Sunflowers in 1987, which sold for £24.75million, and at the time it was the most expensive painting ever auctioned.

In 1990, he also took £5.8million for the Badminton Cabinet, setting the record for any piece of furniture or applied work of art.