46% of universities and 60% of colleges use zero hours contracts to deliver teaching.
68% of research staff in higher education are on fixed term contracts, with many more dependent on short-term funding for continued employment (ref.)
Many of these staff do not get sick leave or holiday pay. They are generally not paid for preparing lecture content nor for any additional work that is part of their teaching such as attending meetings or helping students on a 1-2-1 basis. Many early career researchers hold two or more jobs to make ends meet. There is no guarantee that their contracts will be extended. Many suffer from stress as a result of these conditions of work.
UCU represent these staff and has an anti-casualisation committee It has also been running a campaign to stamp out casualisation in education. For more information on the pensions dispute and the marketisation of higher education, see this post by John Holmwood, University of Nottingham and Gurminder K. Bhambra, Sussex University on Medium (published 03.04.18)