We reflect on the good times given to us in Formula One by the late Ayrton Senna and Roland Ratzenberger, who died 20 years ago this week at the 1994 San Marino Grand Prix at Imola. Jake Sanson discusses the sense of humour and favourite memories of these two racing talents with Lester Forbes, Chris Dawes, Paul Hadsley, Scott Woodwiss and Dave Goddard, and we speak to Ayrton Senna's greatest racing rival Terry Fullerton, and to former Simtek team executive Gwilym Mason-Evans about the events of that tragic weekend.