Royal Mail failed to deliver about a quarter of first-class post on time in recent months, marking a worsening in its recent delivery performance, when it is already under investigation for missing delivery targets.
The company that owns Royal Mail, International Distribution Services (IDS), said about 76% of first-class mail arrived within one working day in the three months to 29 September, lower than the 79% achieved in the previous quarter. It added that 92% of first-class post arrived within two days.
