OFCOM may impose an essential condition on—
every postal operator, or
every postal operator of a description specified in the condition.
An essential condition is a condition containing such obligations as OFCOM consider necessary to impose for, or in connection with, any one or more of the following purposes—
safeguarding confidentiality in connection with the sending, conveyance and delivery of letters,
safeguarding security where dangerous goods are transported,
safeguarding the confidentiality of information conveyed,
guarding against the theft or loss of or damage to postal packets, and
securing the delivery of postal packets to the intended addressees.