A 63-day planning inquiry started on 6 June 1983. By the middle of the following year, Nicholas Ridley the Secretary of State for Transport had indicated that he was "disposed to agree the application", but asked for further details. The Greater London Council brought an action in the High Court of Justice to reopen the inquiry. After the High Court dismissed the action in March 1985, outline planning permission was granted in May of that year, followed by the grant of detailed planning permission in early 1986.