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Is it illegal to open someone else's mail to get return address?

Posted 20th Jun 2013
Hi, do you know if it is illegal to open someone else's mail?
A letter was posted to my address today. The recipient was wrong. That person has never lived at this address. The postcode is wrong though (I.e. not the correct postcode that is associated with my address), although the first line of address is where I live. 'Final notice' is written boldly on the envelope. There is no return address on the envelope.

Question, which may be silly, is it illegal for me to open the letter to find a return address? I don't want debt collectors coming to my door! If it is illegal, what should I do?

Thank you for your kind advice everyone!
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