The Royal Mail has called for timely "regulatory action" to prevent the impact of direct delivery competition from undermining the economics of the Universal Service, after a challenge to the watchdog from delivery rival TNT.
Ofcom is investigating a complaint from TNT over Royal Mail's decision to change conditions and increase the prices it charges to deliver post collected and pre-sorted by its competitors.
Royal Mail chief executive Moya Greene said:"Royal Mail is required to deliver six days a week, overnight, throughout the whole country, to stringent quality standards and at a uniform, affordable tariff.
"Moreover, we are also required to deliver any items TNT Post UK does not consider economic to deliver itself. If TNT Post UK is successful in delivering its stated objectives, this could threaten the fundamental economics of the Universal Service."
More top news
Jordan Burndred's devastated mum Nicola confirmed the news on Facebook saying the 17-year-old 'didn't make it through the night.'
At least four plots attempts to smuggle highly-radioactive materials to Islamic State militants were stopped in the last five years.
Women should be warned not to drink alcohol for the whole of pregnancy to avoid harming their baby, researchers said.