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Engineering workers, members of the Unite union, will walk out for 48 hours from 21 September at two sites – Kettering and Corby, both in Northamptonshire.

This action will be followed by strikes on Tuesday of every week until 30 November.

New contracts pushed by the company will mean changes to engineers’ shift and working patterns, which would result in some workers being up to £5,000 a year worse off.

These changes were rejected by 82% in an industrial action ballot.

Sharon Graham, the newly elected general sectary of Unite said: “If Weetabix decide to go down this route and overstep the line, then I will absolutely defend members.”