Apart from his five Grand Prix victories, John Marshall Watson had two interesting distinctions.
For his final drive in the 1985 European Grand Prix at Brands Hatch, he returned to McLaren to replace the injured Niki Lauda.
It meant the celebrity of competing with the Austrian's race number '1', which Lauda had earned by capturing the World Championship the previous year.
This was only the second time since Ronnie Peterson in 1973 that a driver other than the reigning world champion had been accorded such an honour.
Five years later, as a favour for Eddie Jordan, the then 44-year-old Belfastman became the first driver to test the embryonic Jordan Formula One car.