By the end of 2004, the majority of the existing police radio spectrum, which was subject to serious interference in some areas, was to be withdrawn and replaced by a new spectrum of superior quality, dedicated to use by public safety organisations, on which users would be required to use digital equipment. Knowledge of this change reinforced the need, already identified by the Association of Chief Police Officers (ACPO) and the Home Office, for a new radio strategy. A Review of Radio Communications in the Police and Fire Services of England and Wales was inaugurated, a parallel review was carried out in Scotland, and the Public Safety Radio Communications Project was born. The radios proved exceptional during the 2005 London bombings.