It’s true that if you were creating the Royal Mail today you would probably set up a daily parcels distribution network and pare letters to maybe three days a week. But that was much too radical for the politicians complicit in grooming this firm for sale.
Royal Mail has known for long enough about the parameters it must work under.
You might buy the idea that here is an over-regulated concern led by an under-compensated boss in the shape of Moya Greene.
However, I think that for now such a delivery should really be marked return to sender.