 Complete the following phrase:  Estoril became a popular event on the F1 calendar, the setting for many well-known moments including Niki Lauda winning the championship, his third and final, from McLaren teammate Alain Prost by just half a point by finishing second to Prost at the 1984 Portuguese Grand Prix; three-time world champion Ayrton Sennas first F1 win in 1985; Nigel Mansells notorious black flag incident and subsequent collision with Senna in 