The London Assembly has moved to expand its investigation into Heatherwick’s failed £175m Garden Bridge project.

A new tranche of documents has been summonsed from a list of high-profile figures including former mayor Boris Johnson, TfL commissioner Mike Brown, current London mayor Sadiq Khan and his deputy mayor for transport, Heidi Alexander.

The documents, which are being requested by the committee’s Garden Bridge working group, must be produced within two weeks.

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