THE NATIONAL Association of Schoolmasters Union of Women Teachers has recorded the biggest increase in membership of Britain's 20 largest unions affiliated with the Trades Union Congress.
Its numbers rose last year by 4.4 per cent to 172,852, according to the August edition of Labour Research.
The National Union of Teachers remains the largest in school education, with membership up by 1.9 per cent to 191,828.
The Scottish teachers' union EIS also rose, by 1.2 per cent, to 50,807 members. However, lecturers' union NATFHE suffered a 6.9 per cent slump to 65,065.