Come May, it will be 1 Squadron who will take over the role.
To ensure they are ready, the Gurkhas have been put through their paces on the parade ground in Aldershot.
"In London we'll have responsibility for Buckingham Palace, St James's Palace and the Tower of London but we'll also be doing duties at Windsor Castle" explained Major Nick Heppenstall, Officer Commanding 1 Squadron.
1 Squadron is currently two weeks into their training. They have until 2 May to perfect their drills, when they will then go to Wellington Barracks for an inspection from the General Officer Commanding for London district, who will decide if they are ready.
If all goes well, just three days later they will be Guard Mounting at Buckingham Palace for the first time.
With five weeks to go, Corporal Limbu said: "We are getting there!"