 Complete the following phrase:  Button made his endurance racing debut at the 1999 24 Hours of Spa with BMW Team Raffanelli. Sharing a BMW 320i E46 with David Saelens and Tomáš Enge in the SP class, the trio retired after 22 laps with a fuel tank failure. He began discussions with SMP Racing about sharing a BR Engineering BR1 car in the Le Mans Prototype 1 LMP1 class with Vitaly Petrov and Mikhail Aleshin in April 2018. Button and SMP Racing concluded with an agreement for him to drive most of the 201819 FIA World Endurance Championship. Making his FIA World Endurance Championship debut at the 