SONIA ELKS WHEN Michelle and Robert Sullivan were invited to be in a video for a song by music titans Pharrell Williams and Jay-Z showcasing Black entrepreneurs, they had two main concerns: profanity and if their farm in Scotland was camera-ready. They initially wondered whether the Instagram invitation was genuine if the song's message might clash with their strong Christian values, and if they should decline because they didn't have enough time to tidy up the farm. Now, having overcome their misgivings, the married couple in rural north-east Scotland feature in the video for the hip-hop track "Entrepreneur" which celebrates…