Business Secretary Vince Cable has accused the boss of Royal Mail of "scaremongering" in claiming the universal post service is under threat.
Chief executive Moya Greene has warned that the high cost of the service, which ensures a same-price delivery for letters anywhere in the UK, six days a week, is not sustainable in the face of competition in high-density, low-cost areas.
ITV News business editor Joel Hills reports:
More top news
A delayed thaw with the cold air