Discount grocer Lidl has sacked the head of its German operations after the retailer was found to be spying on its employees and gathering information about their health.

Lidl said Frank-Michael Mros was relieved of his role immediately, and has been replaced by Lidl stalwart Juergen Kisseberth. Documents found in a bin in the Ruhr region found the grocer had violated data protection laws by compiling private information on staff in 2008 and 2009.

Last year Lidl was also fined €1.5m (£1.4m) for being found guilty of hiring private detectives to watch employees with hidden cameras.