It was 35 years ago today, on 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. Today, we catch up with Senna's Team Lotus mechanic, Chris Dinnage. Chris shares his memories of the racing legend both on and off the track and explains in detail how the driver was quick to impress.