Why the Indy 500 will be tougher for Alonso in 2019

It's official - Fernando Alonso and McLaren are going back to the Indianapolis 500 in 2019. But a lot has changed in IndyCar racing since the Spaniard's last attempt, and Glenn Freeman finds out from Tom Errington and Ben Anderson what Alonso will find different next year. We also look at what the project means for McLaren, and how Alonso is bowing out of F1 in frustrated fashion