On May 1, 1994 - 25 years ago today - the world was shocked by the death of three-time world champion Ayrton Senna when he crashed while leading the San Marino Grand Prix at the Imola track in Italy. Declan Colley recalls one of Formula 1's darkest days.

Very few sporting lives have skirted as often, or as wilfully, with drama and danger as Tommy Byrne’s.