Royal Mail is facing a formal investigation by the UK communications regulator after the postal service admitted that almost a fifth of first-class deliveries arrived at least a day late in the year to April.
Ofcom said it would look into Royal Mail’s “failure to meet its delivery targets during the past year” and whether the company was meeting its obligations.
Shares in Royal Mail Group, a member of the FTSE 100, were down 4% by Tuesday…