Ahead of Armistice Day, The Duchess of Cambridge paid a surprise visit to the Imperial War Museum in London to view letters relating to the three brothers of her great-grandmother, all of whom fought and died in the First World War.

Francis Martineau Lupton, The Duchess’s great-great-grandfather (on her father’s side), had five children.

The two youngest brothers, Captain Maurice Lupton and Lieutenant Lionel M Lupton went to France within 3 days of each other in 1915.

The eldest Lupton brother, Major Francis A Lupton fought with the 8th Battalion West Yorkshire Regiment in 1917.

Sadly, each of the brothers was killed in action over a period of three years: Maurice in 1915, Lionel in 1916 and Francis in 1917.

The Duchess was given a tour of the gallery and learnt more about what her relatives would have experienced during their time on the front line.

Kate was shown her great-grandmother Olive’s registration card. Olive and her younger sister Anne were both Voluntary Aid Detachment nurses with the British Red Cross during the War.

These documents form part of the Museum’s document archive, which provides a means to research, reflect and remember the extraordinary contribution and sacrifice made by so families during the First World War.

She wore the lovely bespoke Jenny Packham dress that we saw her wearing as she stepped off the plane in Canada, at the start of the 2016 royal tour. The elegant sheath dress features a self belt, slightly puffy sleeves and a small collar that extends around the back.

Kate carried a new clutch by Mulberry. It is the ‘Amberley’ cross grain leather clutch, available for £495.

For jewellery, The Duchess wore her sapphire and diamond drop earrings from Diana’s collection. She also wore her trusty Cartier Ballon Bleu watch (£6,350).

Kate also had on her favourite Gianvito Rossi 105 praline pumps.

A special touch was the British Legion poppy brooch Kate wore. It is the Women of The First World War Brooch, available at the poppyshop.org.uk for £29.99.

100 years on, The Royal British Legion have created this special brooch dedicated to the memory of the courageous women who served and lost their life as a direct result of the First World War. Each brooch comes with a certificate commemorating the life of a woman who lost her life as a direct result of the War. A perfect choice for today’s event!

For those asking, the Armistice/Remembrance Day poppy is inspired by the World War I poem "In Flanders Fields", which refers to the many poppies that were the first flowers to grow in the churned-up earth of soldiers' graves in Flanders, a region of Belgium.