The Duchess of Cambridge will present the traditional sprigs of shamrock to the Officers and Guardsmen of the 1st Battalion, Irish Guards later today at the St Patricks Day Parade in Aldershot.
450 soldiers will march on to the parade square at their base, Mons Barracks, resplendent in full ceremonial uniform of scarlet tunics and bearskins.
Marching behind the Band of the Irish Guards they will be accompanied by Conmael their Irish Wolf Hound regimental mascot, who will also receive his own sprig of shamrock from the Duchess.
More top news
The plaque at number 16 Cowley Street in Westminster marks the brown brick Georgian townhouse where Sir John lived for 31 years.
A man reportedly armed with several knives has been arrested in Whitehall on suspicion of planning a terror attack, police have said.
Metropolitan Police officer, Tom Harrison, has been crawling the course since the race began on Sunday morning.