Holborn was a district in London.
During the London Event, a group of British Army soldiers made an ammunition run to the London Underground station at Holburn, but it was attacked by Yeti. The only survivors were Colonel Lethbridge-Stewart and the driver, Evans. Captain Knight and Corporal Lane retrieved some of the ammunition and explosives from Holburn and tried unsuccessfully to destroy the Yeti with it. (TV: The Web of Fear)