After Chapman's death, Warr took over the role of the team boss. He hired a young Ayrton Senna to partner Elio de Angelis against the wishes of John Player &amp; Sons (JPS), the team's main sponsor, which wanted to keep Nigel Mansell. After the very wet 1984 Monaco Grand Prix, in which Mansell crashed out of the lead, Warr famously stated that "he'll never win a Grand Prix as long as I have a hole in my arse". Mansell went on to become one of the most successful British Formula One drivers of all time, with 31 race wins and becoming the only driver ever to hold F1 and CART titles at the same time.