Rent hits £48/sq ft at flagship building
Office was sold for £42m in 2019
Historic England and English Heritage exploring office moves
More than 450,000 sq ft of flagship London office now let
Mike Gorman will join the business later this year
Group racked up an £18m loss in most recent accounts
Latest tenant signed to growing team of occupiers
Richard Jackson left last year to start a new venture
Asset is being sold after seven years of ownership