Shahid moved to the UK just over a year ago with only a bag and the hope of making enough money to send to his wife and four children in Pakistan.
On his first day working on the fish stall, Shahid's boss told him to shout to the customers to get their attention. He didn't like shouting so made up a song.
"My customers said to me, 'Your song is very good, so catchy'" Shahid explained.
