Royal Mail says it is illegal for it to open letters, preventing it from stopping fraudulent post deliveries. ... If printed abroad, the letters are then taken to the UK and firms here sort and mass transport them to Royal Mail, which makes the final delivery to peoples' homes.

Why did Royal Mail open my letter?

If it looks as if your mail has been opened, this may be due to machine damage. ... We take the security of your mail seriously so let us know if you think your mail has been tampered with. In addition, please keep the envelope, as it may be needed during our investigation.

Can police open Royal Mail?

4. It is a criminal offence for a postal operator to intentionally delay or open a postal packet, contrary to his duty and without reasonable excuse, in the course of its transmission by post (Section 83(1) PSA).