Royal Mail is facing renewed scrutiny over the reliability of Britain’s postal service after figures showed around 219 million letters could arrive towards the end of this year, raising concerns about service standards even as stamp prices continue to rise.
Analysis of delivery data shows that around 126 million first-class letters will miss their target for next-day delivery this year. At the same time, a further 93 million second class letters are expected to arrive later than the three-day delivery window required under current regulatory standards.
The figures have increased pressure on historic postal operator Royal Mail, which has been accused by MPs and consumer groups of allowing service quality to deteriorate while increasing its focus on its more profitable parcels business.
Royal Mail has highlighted that 92.1 per cent of all postal items are delivered on time. However, critics argue that this headline hides a significant underperformance of the premium first class service.
According to the latest data, just 74.9 per cent of first class letters have been delivered within the next day target so far this year – well below the regulatory requirement of 93 per cent set by UK communications regulator Ofcom.
If this trend continues over the remainder of the year, the deficit will result in around 126 million first-class letters being delivered late, representing around a quarter of all items sent via the service.
The difference in performance has attracted particular attention as the price of a first-class stamp is set to rise again next month to £1.80, almost three times more than a decade ago.
Critics argue that rising postage costs are accompanied by declining service reliability.
Although the standard second class service performs better than the premium first class offering, it still falls well short of regulatory targets.
Data from Royal Mail shows that 90.2 per cent of second class letters are currently delivered within three working days, compared to a legal requirement of 98.5 per cent.
This gap could result in around 93 million second class letters being delivered late during the year.
Combined, the delays to both services could impact more than 219 million letters, further fueling complaints from households, businesses and public services that rely on reliable mail delivery.
The performance concerns have already prompted MPs to act. Last month the Business and Trade Committee launched a rapid investigation into Royal Mail’s delivery performance after numerous reports of late or missing letters.
MPs said they had received numerous complaints from members of the public who found important correspondence had been received days late, including medical appointment notifications, official government notices and personal milestone cards.
In some cases, residents reported receiving bundles of letters several days after their expected arrival date, raising concerns that the letters may be held until delivery.
Royal Mail executives have denied that mail is being deliberately delayed to prioritize parcel deliveries. In correspondence with MPs, the company said its sorting systems group letters by the day they are due for delivery, but stressed it would not intentionally hold up mail in a way that would result in official delivery targets being missed.
However, Royal Mail also admitted that it does not record specific data showing when letters may be deprioritized in favor of parcels, which critics say makes it difficult to fully understand how operational decisions affect service quality.
Royal Mail’s internal analysis of delivery center performance suggests that achieving regulatory delivery targets requires an extremely high level of operational coverage.
The company’s statistical modeling shows that 99.5 percent of delivery addresses must be delivered on time in order for the postal operator to meet the first-class quality standard of 90 percent next day delivery.
With around 1,200 delivery offices across the UK, even small gaps in local delivery coverage can quickly lead to large nationwide deficits.
MEPs expressed concern that staff shortages, changes in delivery routes and the growing volume of parcel deliveries could contribute to declining reliability of letter delivery.
Royal Mail’s difficulties have already led to regulatory action. In October 2025, Ofcom fined the postal operator £21 million after it failed to meet delivery targets for both first and second class mail.
At the time, the regulator said improvements to the company’s operations were “urgent” and required a clear recovery plan.
However, five months later Royal Mail said it could not yet publish the full details of its improvement strategy as negotiations with the Communication Workers Union were still ongoing.
The delay has frustrated some MPs, who argue that more transparency is needed about how the company plans to restore the reliability of Britain’s postal system.
Senior representatives from Royal Mail, Ofcom and the Communication Workers Union are expected to appear before the Business and Trade Committee in Parliament on March 24 to answer questions about the company’s delivery performance and plans for improvement.
MPs are expected to ask whether the Universal Service Obligation (USO) – the legal obligation for Royal Mail to deliver letters nationwide at a uniform price – is being undermined by operational pressures and changing priorities within the company.
The issue has become politically sensitive since Royal Mail’s parent company was taken over by EP Group last year.
During the takeover process, the EP Group legally assured the British government that it would continue to support the universal postal service.
Daniel Křetínský, the group’s chief executive, told the BBC last year that he intended to honor the service “as long as I live.”
The review also comes after Ofcom introduced significant changes to postal delivery rules in July 2025.
Under the updated rules, second class letters will now be delivered every other day of the week instead of daily, while Royal Mail will also have to report performance against new “backstop” targets that measure letters that arrive up to two days late.
The regulator said the changes were aimed at modernizing the postal service while taking into account the sharp decline in traditional mail volumes and the rapid growth of package delivery through online shopping.
But critics argue that despite relaxed standards, Royal Mail is still struggling to meet its delivery obligations.
As stamp prices continue to rise and millions of households still rely on postal communications for essential services, the reliability of the UK’s letter service remains a critical issue that needs to be urgently addressed, MPs say.
