The teenager, who took five pictures of two woman teachers at Enniskillen Royal Grammar School in 2015 and 2016, has been found guilty on five counts of committing acts of outraging public decency.

The teachers’ union NASUWT, which pressed for the Public Prosecution Service (PPS) to take action against the pupil, welcomed the verdict.

However, it called for legislation to be enacted to create an offence of upskirting in criminal law, bringing Northern Ireland in line with legislation in England and Scotland.

Chris Keates, NASUWT general secretary, said: “Our members have had to endure not only the violation of knowing that a pupil took intimate images of them while they were teaching, but also several years of anxious delay before this case could be brought to court. It was only due to the persistence of the NASUWT and the strength and resolve of the members that it did so at all.

“We very much welcome today’s verdict which will hopefully provide the teachers with a sense of closure and allow them to move on from these distressing events. It also sends out a clear message to pupils that engaging in such degrading behaviour is completely unacceptable.

“Today’s verdict sends a message to teachers that they do not have to put up with sexual harassment or abuse in the workplace. Where teachers are experiencing such abuse they can know that the NASUWT will act to protect their right to work in safety.

“This case has highlighted the inadequacy of current laws around sexual harassment in Northern Ireland. Legislation has failed to keep up with the advent of mobile technology and it is clear new powers are needed to create an offence of upskirting, which would bring Northern Ireland into line with the laws in England and Scotland.”