Daily Mirror, 3rd August 1987
Evening Argus (Brighton), 16th April 1986
More on the 1983 Brighton case here
In 1983, several boys were drugged and sexually assaulted by an unknown attacker on the Frampton Park Estate in Hackney. This was the same estate where Robert Oliver and Leslie Bailey lived as of 1989 (source). They were convicted for their part in drugging, sexually assaulting, and killing boys at a flat on the nearby Kingsmead Estate, with Sidney Cooke, Lennie Smith, Stephen Barrell, and a number of unknown men.
Hackney Gazette, 29th July 1983