'Inadequate work' Police believe Reid may have been responsible for dozens of other attacks and have launched a help line for potential victims.
DNA was twice recovered from victims but, despite being known to police as a potential sexual attacker, following a 1995 charge of indecent assault, no DNA sample was collected from Reid.
Reid, a children's football coach, who worked as head chef at Camberwell College, was acquitted of the 1995 charge, but remained on the police database.
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In most cases, the victims were grabbed from behind and forced to the ground.
These attacks took place between August 2001 and October 2007.
The case has been sent to the Independent Police Complaints Commission for a full review. He also admitted two further charges of indecent assault and was found not guilty of one charge of indecent assault.
BBC home affairs correspondent Andy Tighe said the delay in apprehending Reid raised serious concerns among senior Metropolitan officers about the performance of the force's dedicated Sapphire unit that investigates sex crimes.
A serial sex attacker who targeted lone women in south London over a six-year period has been found guilty of rape and sexual assault.