In a statement published with the list on its website, Royal Mail said it was “working hard to deliver the most comprehensive and high quality service we can to all our customers”.
The statement continued: “The combination of greatly increased uptake of online shopping, and the ongoing Covid-19 restrictions, mean that all delivery companies are experiencing exceptionally high volumes.
“Despite our best efforts and significant investment in extra resources, some customers may experience slightly longer delivery timescales than our usual service standards.
“This is due to the exceptionally high volumes we are seeing, exacerbated by the coronavirus-related measures we have put in place in local mail centres and delivery offices to keep our people and customers safe.
