Having driven privateer Porsches, for the 1969 World Sportscar Championship season Attwood was signed to the Porsche works team. Commonly paired with fellow Brit Vic Elford, the season's highlights were a pair of second places, driving the Porsche 908, in the BOAC 500 (the drivers' home race at Brands Hatch) and the Watkins Glen 6h race. Later in the season Attwood was again involved in the development of an iconic sports racing car: the Porsche 917. The Elford/Attwood pairing took their 917 up to 327 laps in the 1969 24 Hours of Le Mans, but the car suffered a gearbox failure with only two hours to go, after leading for a substantial portion of the race.