Asda has put close to 300 jobs at risk and announced plans to move over 4,000 workers to lower-paid roles.
The supermarket giant, which is owned by the billionaire Issa brothers and TDR Capital, is proposing to move some overnight restocking shifts at 184 of its sites to the daytime.
If the plans go ahead, 211 night shift manager roles will be at risk.
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Asda added that the changes will also affect 4,137 hourly paid workers, who will see shift patterns moved to daytime and lose their night shift pay premium, of at least £2.52 per hour.
It also revealed a 22% reduction in employee hours across all Post Offices, with four Post Offices reducing opening hours by c.9%.
The proposal will impact 23 salaried Post Office managers and 200 hourly-paid colleagues.
Meanwhile, it will also shut seven in-store pharmacies, which employ 14 pharmacists and 48 other workers.
Ken Towle, Asda’s retail director, said: "The retail sector is evolving at pace and it is vital we review changing customer preferences, along with our own ways of working, to ensure we are operating as efficiently as possible, so that we can continue to invest and grow our business.
"We are now entering a period of consultation with our colleagues on these proposals.
"We recognise this will be a difficult time for them and will do all we can to support them through this process."
The news comes after BusinessLive reported that the Issa brothers are considering a £13bn merger of Asda with their Lancashire-headquartered EG Group.
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