The following is the press conference held by the West Yorkshire Police at 9 pm on Sunday, January 4 1981, to announce the arrest of a suspect in the Yorkshire Ripper case, from the book "Press Conduct In The Sutcliffe Case", a report by the Press Council (1983). The Press Council was able to obtain, from the Independent Radio News, a recording made by Pennine Radio of some five minutes of the press conference, and the transcript is provided below.
(NOTE: Source (used by permission): The Press Council, "Press Conduct In The Sutcliffe Case" Photo source: Paul Begg & Martin Fido, "Great Crimes And Trials Of The Twentieth Century")