Under the 2001 Sexual Offences Act it is against the law for a teacher to have a sexual relationship with a pupil over the age of 16 who attends their school. However this does not apply to a teacher who has a similar relationship with a pupil over 16 at a different school. Chris Keates, the union's general secretary, describes this situation as an, "anomaly, which criminalises a teacher but would leave any other adult...