[2] The NAMT continued its campaign to further the interests of male teachers, changing its name in 1920 to the National Association of Schoolmasters (NAS).

[3] The NAS aimed to recruit every schoolmaster into the NAS, to safeguard and promote the interests of male teachers, to ensure recognition of the social and economic responsibilities of male teachers, and to ensure the representation of schoolmasters on matters concerned with education, with both the local education authorities (LEAs) and government.

[6] The merger was largely a consequence of the Sex Discrimination Act 1975, which made it unlawful to exclude from membership on grounds of gender.

[12] The NUT general secretary also held the joint secretaryship of the main Burnham Committees and the leadership of their Teachers' Panels for most of their existence.

An independent body to examine and report on such matters relating to the statutory conditions of employment of school teachers in England and Wales.

From 2003 to 2010 the NASUWT was involved in "social partnership" – a programme of meetings between union leaders, the Labour government and employers' organisations.

In November 2011, members of the NASUWT voted by a 4-to-1 margin[17] (on a 39% turnout)[18] to take strike action, and begin working to the letter of their contracts.

[19] The NASUWT set aside historical differences with the National Union of Teachers; a joint declaration in May 2012[20] led to a co-ordinated work-to-rule and strike action in autumn 2013.

[26] NASUWT encouraged its members to join marches sponsored by the TUC,[25] and participated in the Robin Hood tax campaign.