Outside of Croydon and Brighton, the reason as to why matches between the Eagles and the Seagulls mean so much is always a matter of confusion.
The reason dates back to the mid seventies and a former Brighton and Palace manager is the main character in the story.
Click on the Palace TV video created last year to mark Brighton's long-awaited return to the Premier League, to find out why this 'M23 derby' game means so much to both sets of fans.