Many Post Office workers over the past years have been prosecuted for the criminal offence of the "Wilful delay of mail" when on occasion they have gone home early and left mail overnight in their car-, or elsewhere. Not all but many do intend to deliver in due course but have been dismissed or prosecuted when caught. In the past the Postman would call at the address with an underpaid postal item and collect double the underpaid amount - with no additional fee. After all, the poster has already paid in good faith a fee for the delivery pof the item and was possibly not aware the item may have been slightly overweight.
How is it the Royal Mail get away with charging an administration fee of £1 for deliberately taking the item out of the normal post stream? Currently the Banks are being admonished for the inappropriate charges they make for sending a letter to customers who may have overdrawn their account. I have had numerous letters missing and many taking days to be delivered !