Ironically for Derek Warwick, his initial contract with Renault was only for the 1984 season. During the year he was approached by the Williams team, who used turbocharged Honda engines, about driving for them in 1985 as a replacement for Jacques Laffite who was moving back to Ligier. As the results for the Honda engine had been relatively poor other than Keke Rosberg's win in the 1984 Dallas Grand Prix, Warwick felt his chances of winning were greater with Renault and he re-signed for the 1985 season, while the Williams drive eventually went to Nigel Mansell. It was a decision that Warwick would later regret as the 1985 Williams FW10 and its Honda engines won four races in 1985, including giving Mansell his first two career wins, the second of which was the South African Grand Prix that saw the French F1 teams, including the State owned Equipe Renault, boycott the race under the direction of the French Government in protest to South Africa's Apartheid policy. While Mansell would go on to ultimately win 31 races and the World Championship in his career, Warwick's Formula One career never recovered and he would never win a Grand Prix or drive in a truly competitive car again.