The D-Series race, sponsored by Sir Jackie Stewart (12 laps) was exclusive to F1 cars from the 1966 to 1972 seasons, equipped with naturally-aspirated 3-litre engines. Michael Lyons, who started from pole position, looked set to resume his winning ways in the Principality, at the wheel of a pretty 1971 Surtees TS9, but a mechanical problem at the Rascasse forced the Englishman to return to the pits, passing the lead to Katsuaki Kubota (Lotus 72). The 62-year-old Japanese driver, who had already won here in 2014, was very emotional after passing the finish line: “I think a lot about my father today, because he passed away at the end of April. He helped me a lot to become a driver“, said the winner before climbing onto the podium, like Ronnie Peterson in the same car, in Monaco, in 1973 (3rd). He was joined on the podium by Britain’s Matthew Wrigley (March 721), who started on the second row, and ‘Mr John of B’, in a superb Matra MS120 with a V12 engine. A special mention goes to Adrian Newey, the brilliant engineer from Red Bull Racing, who finished a superb 4th, just off the podium, in a red 1968 Lotus 49B built ten years after he was born. Time flies…