Royal Mail has issued a disruption warning affecting 14 postcode areas across the UK due to delays in mail deliveries. The service was suspended on May 25 for the Spring Bank Holiday, and while operations resumed the following day, certain locations are still facing issues. Areas impacted include parts of London, Nottingham, and Leamington Spa. Royal Mail acknowledged that local factors such as high sick absence and resourcing challenges are contributing to these delays. The company has committed to improving delivery reliability, aiming for 85% of First Class mail to be delivered on time within nine months, and 93% of Second Class letters within three days. The postal service has faced scrutiny for previous delays, resulting in a £21 million fine from Ofcom for missing delivery targets. Jamie Stephenson, Royal Mail's chief operating officer, stated that significant investments are being made to enhance service reliability and adapt the delivery network to current mailing trends. The new delivery model is set to be implemented across the country by the Christmas peak period.