内容摘要：There will also be additional rail services running throughout Belsonic.

There will also be additional rail services running throughout Belsonic.

He had sent indecent videos to some girls and asked for them to send some back to him.Cheshire Police praised the complainants for their bravery and described Clark as a sexual predator who despite being in a position of trust, continued his crimes to "satisfy his own warped sexual desires".

Sentencing him to eight years, Judge Simon Berkson said his crimes were "a parent's worst nightmare" and showed "clear grooming of young girls".He said it was "well planned, sophisticated, criminal behaviour".As a result he said Clark had "lost everything" including his job, marriage and unsupervised access to his own young children.

He will face an extended four years on licence at the end of his sentence.An NSPCC spokesperson said: "As a teacher Clark had a duty to keep children safe.

"Instead for seven years he posed as a teenage boy on a social media platform, using his fake profile to target and groom young girls before persuading them to send naked images of themselves.

"This kind of sexual abuse can have a devasting impact on the victims and it is vital all the children involved in this case have access to the support they need to move forwards with their lives.It has already been used to survey the thousands of books in the St Andrews collections and in the National Library of Scotland, and the team hope to share their design with other institutions around the world.

"We're lucky as a large institution to have expensive kit, so that we can test 19th Century potentially toxic books," says Dr Jessica Burge, deputy director of library and museums at the University of St Andrews."But other institutions with big collections may not have those resources, so we wanted to create something which was affordable and easy. It doesn't require a specialist conservator or analysis, and it's instant."

It's also a problem which isn't going away. If anything, toxic books will become more harmful as they get older and disintegrate.Identifying them means they can stored in a safe way and still enjoyed with controlled access and precautions such as wearing gloves.