[1] Upon moving to London in 1921, Webb befriended members of the avant-garde, including art historian and critic Roger Fry of the Bloomsbury group.
He was then in the historical section of the War Cabinet Office and joined the Monuments, Fine Arts, and Archives program.
Following the German surrender, Webb was named Chief of the MFAA Branch, British Element control Mission, He was integral to the post-war restitution effort in France and Germany.
He also helped to expose notorious art forger, Hans Van Meegren, after being altered to his deception by “Monuments Man” Major Ellis Waterhouse.
[2] As a measure of gratitude for his role in revealing von Meegeren’s deception, the Dutch government gifted Webb one of his forgeries, The Procuress.
In 1934 he married Marjorie Isabel Batten, an architectural historian who later devoted her career to English eighteenth-century sculpture.