It is the second time production has been affected in two months. Work was also halted in December because of
congestion at ports caused by stockpiling.
The firm is 60% owned by French state rail firm SNCF. The UK government sold its stake in the business to private companies for £757m in 2015.
The Observer reports that no companies have been prosecuted and fined for breaking workplace coronavirus safety rules since the start of the latest national lockdown in England, although a spokeswoman for the HSE said figures on enforcement action, which can include...
Industry groups had warned there was only so long airports could "run on fumes", following the announcement of the new quarantine rules.