Harry George Hayman used his position of trust to select his victims before allegedly abusing them or exposing himself to them, it is claimed.
The 69-year-old, who is also known as Gary, is on trial in the Royal Court this week accused of committing five indecent assaults against girls under the age of 11, and exposing himself to a girl aged between 12 and 14.
He also faces a charge of procuring a boy aged nine or ten to commit an act of gross indecency on him. The seven incidents are said to have taken place between 1976 and 1995. He denies all of the charges.
