Lt Col Toby Gray, commanding officer, 1st Battalion Coldstream Guards, said Lt Dalzell was "assured, confident, utterly professional and hugely popular with his men and held in the highest regard by his seniors".

BBC: Lt Douglas "Dougie" Dalzell

Singer Alesha Dixon will perform with The Corps of Drums of the 1st Battalion Coldstream Guards and 1st Battalion Irish Guards, while singer Pixie Lott will appear alongside trumpeters from the Band of the Grenadier Guards.

BBC: Poppy appeal launches with concert

He joined the TA 16 years ago after serving in the regular Army with the Coldstream Guards and Household Division from the age of 15, retiring as a senior drum major who led parades at prestigious events such as the Trooping of the Colour.

BBC: Part-time soldiers 'proud to serve'