It's no wonder Arsenal and West Ham took so long to find common ground on Declan Rice — the new £105million man is the first player the Gunners have ever bought from their London rivals.
14 players have gone the other way from north to east London in the Premier League era, however, making it one of the most commonly trodden routes between clubs even though it has earned Arsenal only £12.7m back in fees.
Here, Mail Sport reveals each top-flight club’s favourite wells to return to since the Premier League began… and finds out which teams have been fleecing each other!