Prison educators at more than 70 prisons and young offender institutions were set to strike on Wednesday of this week over attacks on their terms and conditions.
In a ballot 78 percent voted for action.
UCU union members employed by The Manchester College (TMC), which runs courses at institutions throughout Britain, are threatened with new contracts.
These mean increased working hours and a reduction in holiday and sickness entitlement. Some staff could lose as much as £7,000 a year.
UCU general secretary, Sally Hunt, said “It is deeply concerning that Britain’s largest prison education provider is trying to force through new contracts that will seriously jeopardise prison education in over 70 institutions.
“The new contracts would mean fewer rehabilitation opportunities for offenders.”
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