A union has condemned students for "electronic bullying" after a clip was posted on YouTube of an Epsom teacher using the toilet.

The clip lasts four minutes and was posted onto the popular video website YouTube last month.

The pupils from Rosebery School, in White Horse Drive, caused controversy last month when we reported the litter and mess they had caused in Rosebery Park after celebrating their final day at school.

The video footage shows a number of students filming themselves in a music room at the school before being caught by a teacher who challenges them as to whether they are supposed to be in there.

"Are you allowed to be in here?" she asks the girls. "Have you got permission to be in here? That'll be a no then. What are you doing at half past three? Come back and see me."

The teacher then confiscates the phone, unaware that it is still recording and walks into a toilet cubicle and places the phone on the floor which records her as she uses the toilet. She then stands in front of a mirror behind a sink, realises that the camera is still recording and looks directly into the lens before it is switched off.

Ted Truscoe, assistant secretary of Surrey branch of teachers union NUT said the video could be classed as harrassment.

"We're very worried about electronic bullying," Mr Truscoe said.

"I think it causes a great deal of anxiety for teachers and other staff at the school.

"I think if we had ourselves under surveillance all the time it would make the job very difficult.

"But certainly uploading a video onto Youtube is something which we would condemn very strongly."

www.yourlocalguardian.co.uk has reported the video to YouTube but it will still come as a blow to headteacher Heather Saunders who only last month defended her students' behaviour following the Rosebery Park incident.

So far the video has received just under 400 views, but comments have already been streaming in from pupils.

One comment posted underneath the video says that they "waited too long for it to be put on youtube...should of been done ages ago!" while another claims it "was terrible, why did she take into (sic) the bathroom with her? Lol she's so stupid! Oh my god.. that's legend!"

Headteacher Mrs Saunders was unaware of the video until contacted by www.yourlocalguardian.co.uk "But students do this in all schools," she said. "This is one of the things about the internet."

Having watched the video, she added: "The clip is not of a lesson.

"We have several small music practice rooms which girls who have peripatetic music lessons are allowed to use at lunchtime to practise their pieces.

"It looks as though three girls are messing around rather than practising and so the member of staff on duty sends them out and confiscates the phone.

"The phone is confiscated because girls are not allowed to have their phone with them during the school day - phones should be locked in their lockers."