By 1976 Sullivan was Counsel for the Department of Environment's M25 motorway public inquiry Other clients he represented included the London Borough Councils of Hammersmith and Haringey as well as the Attorney General; while he has worked closely with Harry Woolf in matters of Planning Law.
By 1976 Sullivan was a key figure in the Department of Environment's M25 motorway public inquiry, representing notable clients including the London Borough Councils of Hammersmith and Haringey, as well as the Attorney General. He also worked closely with Harry Woolf on Planning Law-related issues.