It was Sunday 21 April and the 1985 Portuguese Grand Prix. Behind the wheel of a Lotus 97T was Ayrton Senna, just turned 25 years old. With the car at the absolute limit of its grip, he delivered a masterclass in wet-weather driving for the hardy Estoril crowd and powered to the chequered flag. Such was his dominance he lapped the entire field up to second place, finishing over a minute ahead of his nearest competitor.