According to the Daily Record, Primal Scream members Andrew Innes and Bobby Gillespie bumped into him in the post office.
The legendary singer struck up a friendship with the Scots pair while in the queue at a branch in Primrose Hill, which is near his home and Primal Scream’s London recording studio.
And when he suggested the lads should give him a shout if they needed any help on their new album More Light, Andrew and Bobby wasted no time taking him up on the offer.
Andrew said: “Robert has a house near our studio. It is bizarre. We see him in the post office all the time.
“We were in the post office when he asked us what we were up to and Bobby told him we were working on the new record.
“He made the mistake of asking if we needed any help, so we got back to him and asked him to come and help us out.
“We also meet him from time to time in the nearby Russian tea room and walking down the street.
“It is weird to think, ‘Here’s the hammer of the gods coming’. But you don’t want to be at the back of the post office queue with Robert Plant on pension day.”
Plant sings with Bobby on the Primal Scream track 'Elimination Blues', which features on the album.
Read moreat the Daily Record.