Sally Hunt is currently General Secretary of the University and College Union (UCU), and the last General Secretary of the Association of University Teachers (UK) prior to its merger with NATFHE to form the UCU. The below letter from Rhetta Moran and myself is self explanatory. See also this and this for some background.
For pdf version of letter and attachments see here. For many other UK cases involving AUT/UCU/NAFTHE inaction see the extensive Bullied Academics blog