Employment decreased by 220,000 between April and June, with younger and older workers worst hit.
This is on top of the 4,000 announced since May, meaning the retailer will have cut a third of its staff.
Physical distancing among students is not required but hand sanitisers and one-way systems is the norm.
Health minister Edward Argar says it is "evolving and flexing", amid plans to cut 6,000 contact tracers.
Immigration Minister Chris Philp said new measures are under discussion with French officials.