Because of the size and constitutional structure of London, the non-statutory title and office of Representative Deputy Lieutenant (Rep DL) was created in 1951 by Viscount Alanbrooke. The Lord-Lieutenant selects one of his DLs to represent him in each of the 32 London Boroughs (but not the City). Their main function is to represent the Lieutenancy and occasionally the Lord-Lieutenant at civic and other official functions within their boroughs, and also to promote its voluntary, charitable and youth activities.