The DCSF Guidance Absence and Attendance Codes 2009 states that parents may not authorise absence, only schools can do this.
Absence for the following reasons may well be authorised where parents have confirmed the reason for absence. Consideration will be given to procedures where parents have difficulty with the written word, or where English is not the first language:
ii. unavoidable medical/dental appointments
iii. days of religious observance
iv. exceptional family circumstances i.e. bereavement
v. if permission for absence has been granted by the Headteacher
vi. Transport arranged by the council has failed to arrive where the student lives beyond statutory walking distance