For Paul Goodman, a professor of organisational psychology at Carnegie Mellon University who has made a documentary on the dabbawalas, this is one of the critical aspects of their appeal to Western management thinkers.

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The Belgian-born Thielemans has played with Benny Goodman, Charlie Parker, Paul Simon, Miles Davis, Milt Jackson, Billy Joel, Ella Fitzgerald, Quincy Jones and many others.

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They are director of Liberty, Shami Chakrabarti, the former chief constable of the West Midlands Sir Paul Scott-Lee, former chairman of Ofcom Lord David Currie, former political editor of Channel 4 news Elinor Goodman, former Daily Telegraph political editor George Jones, and former FT chairman Sir David Bell.

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