A third former teacher from the same private school has been found guilty of sexually abusing young boys.

Patrick Marshall, 68, was found guilty of 24 counts of indecent assault and one count of indecency with a child, involving ten victims, at both St Paul’s School in Lonsdale Road, Barnes, and at Windsor Boys’ School, where he had previously taught.

Marshall preyed on the boys in the 1970s. He will be sentenced at Southwark Crown Court this afternoon.

He is the third former St Paul’s teacher to be convicted after a historic investigation into the school.

Former teacher Michael Ellis, 71, was jailed for eight years in July 2016 after being found guilty of indecent assault against two boys. He also admitted four counts of possessing indecent images of children.

David Sansom, 72, was found guilty in November of abusing four children, one of whom was a St Paul’s pupil, and was sentenced to a total of 14 years and nine months’ behind bars.

Legal restrictions had previously prohibited the reporting of the convictions of Ellis and Sansom.

Ellis had befriended the family of one of his victims before the abuse occurred, while Sansom’s abuse included an offence in a changing room at St Paul’s School and a classroom at another school in the 1970s and '80s.

A spokesman for St Paul's said the school was "deeply saddened" by revelations of sexual abuse, and that it was "reaching out" to victims.

Crown Prosecution Service reviewing lawyer Samuel Main said: “We hope the conviction of Patrick Marshall today, along with the convictions of two other former St Paul’s teachers, will bring some sense of justice and closure for their many victims.

“These men groomed and abused vulnerable boys using their status as teachers, in Marshall’s case befriending their families before going on to abuse their sons and their trust.

“In Marshall’s trial the court heard the testimony of parents who had to come to terms with the horrific realisation their sons had been abused, and the evidence of the victims themselves, each forced to relive their experiences in court by his refusal to admit the truth.

“Each of the victims has shown great bravery in coming forward and but for their courage it would not have been possible to bring these prosecutions.”