UK Royal Mail - addressee gone away; does it make sense to send the package again?

Hi :)

From time to time I deal with packages sent within Great Britain via Royal Mail and these packages are sometimes returned with a label on them with the following option ticked: "addressee gone away" and I don't realy know what it means.

• Does it mean that the addressee does not live at this address any longer and has moved to somewhere else?
  or
• Does it mean that the person was not at home when Royal Mail was trying to deliver the package?

I would be grateful if somebody could help me and explain what it mean. I tried to find some information on the Internet but what I have found is quite opposite:

Version 1:

I read on the Internet that the post office has to deliver the letter at the given address by putting it into mailbox. Then, the person who lives there picks up the letter from the mailbox. If the addresse had lived there before but does not live now, the person who picked up the letter writes on it "the addressee gone away" and puts it back into the mailbox. Then, the postal operator takes it back to the postal office, places the approperiate label and sends it back to the sender.

Version 2:
I read on the Internet that it is just a default option marked when they are not able to deliver the package.

To sum up, I am wondering whether it makes sense to try sending the package one more time. If the person just was not at home, it makes sense. If the person does not live there any more, it is meaningless.