The lawyer for Jamie Gardiner, a London teacher facing numerous charges, was in a London court on Tuesday.
The 37-year-old - who was fired by the Thames Valley District School Board earlier this month - was not in court for the hearing.
He is facing charges including 19 counts of voyeurism, making child pornography and possessing child pornography.
The charges relate to the discovery of a camera concealed in a knapsack in a change room at Ashley Oaks Public School.
Police have said they identified 20 female victims in images dating back to January 2011.
The case was put over until June 30.
