Royal Mail staff self-isolating after two confirmed cases at Medway Valley sorting office, in Sortmill Road, Snodland | Updated: 11:48, 15 December 2020 Royal Mail staff are self-isolating after two confirmed cases of coronavirus at a sorting office in Snodland. "A small number" of employees at the Medway Valley sorting office, in Sortmill Road, were instructed to self-isolate by the test and trace service and the office is running as normal, a company spokesperson said. The Royal Mail sorting office in Snodland Picture: Google The spokesperson did not respond when asked how many employees are self-isolating. They said: âA small number of staff are self-isolating through the Test and Trace service, following two confirmed cases for coronavirus at The Medway Valley Sorting Office.