Royal Mail is to be told to consider cutting deliveries to just three days amid a potentially rocky future for the service.

Ofcom is expected to publish a document outlining potential options for the future of the delivery company’s postal service later today.

It is understood that the review update is not likely to recommend specific proposals but will outline evidence from Royal Mail and potential options to change the service to more closely meet the needs of customers.

Ofcom said that the two “primary options” for letter deliveries include changes to the number of days that letters are delivered a week.

Ofcom said the postal service could save between £100 million and £650 million

That could mean that letters are only delivered to households and businesses five, or even three times per week. The Government would have to change the law for this to happen. This could save Royal Mail between £100 million and £650 million, the regulator said.