The agency, which is moving from owner Capita's London-based Victoria offices to premises on King William Street in the City, has also bolstered its headcount by two. Freelancer Vicky Nutt joins BSI as senior events manager, while graduate Danielle Fogarty joins as events manager.
Mark Scales, BSI's client services director, said that the agency is looking to fill a further three to four account management roles.
"At the moment we're based in Capita's offices, but we've outgrown them in the six months we've been there," he said. "So what we've done is to establish a flagship office in central London, giving us room to expand. It's a deliberate move to create a City presence."