Instructors are 'unqualified teachers' who the law allows to carry out the same duties as qualified teachers. Instructors can be employed:
to give instruction in any art or skill or in any subject or group of subjects (including any form of vocational training), where special qualifications or experience or both are required, in order to give such instruction
if the school or local authority is satisfied that he/she has the necessary special qualifications or experience or both to do the job
if there is no suitable qualified teacher, graduate teacher, registered teacher or teacher on the employment-based teacher training scheme available for such appointment or to give such instruction
only for such period that no suitable qualified teacher, graduate teacher, registered or teacher on an employment based teacher training scheme is available.
This is by no means an exhaustive list but examples of instructors might include:
a linguist or an interpreter as an instructor to teach one or more foreign languages
an artist to teach art
a musician to teach music
a carpenter to teach woodwork
an actor to teach drama.
Instructor posts should only be offered for as long as there is no qualified teacher or person on an employment based route to QTS available to supply those skills or qualifications.