This article explores the topic of diversity in the teaching workforce though the enactment of policy concentrating on teachers with dyslexia within the Further/Vocational Education and Training sectors of England and Finland. Two research projects from Finland and England focusing, respectively, on individual teachers' perspectives and managers' understandings of hidden diversity (such as dyslexia) are re-analysed through the use of the distinction between the ostensive and the performative aspects of organisational routines. The article contributes a new application of theory by drawing upon organisational routines as sources of flexibility and change rather than continuity alone. Avoiding the confusion between the ostensive and performative aspects of routines enables a more dynamic and emancipatory understanding of the identification and support for the promotion of workforce diversity to emerge.