In other state-funded schools, people employed as teachers have to have passed the relevant qualification - known as Qualified Teacher Status (QTS).

BBC: Warning of rise of 'unqualified teachers' in classrooms

More than a third of physics teachers (around 2, 000 teachers), half of those teaching Spanish (around 3, 400), over half of information and communications technology (ICT) teachers (around 9, 200) and more than two in five religious education teachers (around 6, 500) do not hold a relevant qualification higher than an A-level.

BBC: Hundreds of school leaders paid in excess of ?100k

Almost one in four (23.1%) maths teachers - around 7, 500 - do not have a relevant degree-level qualification, along with a fifth (20.1%) of English teachers - around 7, 300 in total.

BBC: Hundreds of school leaders paid in excess of ?100k