Williams-Honda. (The seat was then offered to Nigel Mansell who, accepting the position, went on to win two races at the end of the season.) 1985 was a poor one for Renault and the team withdrew from Formula One at the end of the year. Renault's withdrawal, and Ayrton Senna's refusal to let Warwick join him as teammate at Lotus (using his contracted number one driver status in the team, Senna refused to have anyone but a pure #2 as his teammate as he believed Lotus were not capable of supporting two championship contending drivers), left Warwick without a team for the season and he took up an offer to drive for Tom Walkinshaw's TWR Jaguar team in the World Sportscar Championship. Following the death of Elio de Angelis in a testing accident in May, however, Warwick was invited to take his place at Brabham. Unconfirmed rumours surfaced that Brabham owner Bernie Ecclestone had invited Warwick to take de Angelis's place as the Englishman was the only available top driver who had not actually contacted the team offering his services in the days following the Italian's untimely death. Warwick explained: "I got a phone call from Bernie, who said that he really appreciated the fact that I didn't call him five minutes after Elio had died and would I like to drive for him." As no Grands Prix clashed with his Sportscar commitments, Warwick was able to race in both world championships. In 1987, Warwick moved to the Arrows team alongside his Jaguar teammate Eddie Cheever, ending the season with 3 points scored. The 1988 season saw an improvement on the Arrows performance due to the powerful Megatron (a re-badged BMW M12) engine and Warwick finished 7 times in the top 6, earning him 17 points and a respectable 8th position in the championship. His best race of the season was 4th in the Italian Grand Prix at Monza where he finished only half a second behind Cheever. Italy was also notable in that it was the first time since the beginning of 1987 that Arrows engine guru Heini Mader finally solved the problem with the FIA's mandatory pop-off valve which restricted turbo boost. For the first time this allowed both Warwick and Cheever to fully exploit the power of the Megatron engine (restricted to 2.5 BAR boost in 1988) and be much closer to the front than they had