Ron Dennis and Ayrton Senna's Formula 1 careers became irrevocably entwined as the legendary Brazilian won his three titles with McLaren. Five years ago, as Formula 1 marked 20 years without Senna, Jonathan Noble heard Ron's personal stories of working with the man who defined his time at the head of McLaren more than anyone else…

There are few people, if any at all, better qualified to talk about Ayrton Senna the racing driver than Ron Dennis, his boss at McLaren. It's Dennis's voice that perhaps carries the greatest resonance at moments like this. His and Senna's relationship was not just a successful sporting partnership – it went much deeper than that.