It is the fourth large London venue to have appointed Jackson Gilmour this year – others include the V&A, Science Museum and the Museum of London.
Anne Aitken, marketing director of Jackson Gilmour, said: "This venue is a great match for many of our loyal clients who want a stand-out venue in the centre of the City. The stunning Jerwood Hall is a fantastic space for dinners and receptions."
Last week, it had taken Jackson Gilmour off its supplier list in a reshuffle that will remain in place for the next three years.
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