Question: The 1968 British Grand Prix was won by a driver born in what year?

Context articles: British Grand Prix (squash) 2015
Jo Siffert
2017 British Grand Prix
British Grand Prix (squash) 2012
2014 British Grand Prix
British Grand Prix (squash) 2011
2000 British Grand Prix
John Taylor (racing driver)
1968 British Grand Prix
2015 British Grand Prix

The British Grand Prix 2015 is the British Grand Prix (squash) for 2015, which is a tournament of the PSA World Tour event International (Prize money : 70 000 $).
 The event took place at the National Squash Centre in Manchester in England from 11 September to 14 September.
 Mohamed El Shorbagy won his first British Grand Prix trophy, beating Nick Matthew in the final.
Joseph Siffert (7 July 1936 – 24 October 1971) was a Swiss racing driver.
The 2017 British Grand Prix (formally known as the 2017 Formula 1 Rolex British Grand Prix) was a Formula One motor race that took place on 16 July 2017 at the Silverstone Circuit in Silverstone, United Kingdom.
 This race was the seventy-second running of the British Grand Prix—the first having been held in 1926—and the tenth round of the 2017 Formula One season.
 The race marked the fifty-second time that the race has been held at the Silverstone Circuit since the Formula One series inception in .
The British Grand Prix 2012 is the 2012's British Grand Prix (squash), which is a tournament of the PSA World Tour event International (Prize money : 70 000 $).
 The event took place at the National Squash Centre in Manchester in England from 21 September to 24 September.
 Nick Matthew won his first British Grand Prix trophy, beating James Willstrop in the final.
The 2014 British Grand Prix (formally the 2014 Formula 1 Santander British Grand Prix) was a Formula One motor race held on 6 July 2014 at the Silverstone Circuit in Silverstone, United Kingdom.
 It was the ninth round of the 2014 Formula One season, and the 69th British Grand Prix.
 The 52-lap race was won by Lewis Hamilton for the Mercedes team, from a sixth position start; the lowest position he has ever won from.
 Valtteri Bottas finished second in a Williams car, with Daniel Ricciardo third for the Red Bull Racing team.
 This race was the first to be red-flagged on lap one since the 2000 Monaco Grand Prix.
The British Grand Prix 2011 is the men's edition of the 2011 British Grand Prix (squash), which is a PSA World Series event Gold (Prize money : 115 000 $).
 The event took place at the National Squash Centre in Manchester in England from 19 September to 25 September.
 Ramy Ashour won his second British Grand Prix trophy, beating Nick Matthew in the final.
The 2000 British Grand Prix (formally the LIII Foster's British Grand Prix) was a Formula One motor race held on 23 April 2000 at Silverstone Circuit, England, United Kingdom.
 It was the fourth race of the 2000 Formula One season and the 53rd British Grand Prix.
 The 60-lap race was won by McLaren driver David Coulthard after starting from fourth position.
 His teammate Mika Häkkinen finished second with Michael Schumacher third for the Ferrari team.
John Malcolm Taylor (23 March 1933 – 8 September 1966) was a racing driver from England.
 He participated in five World Championship Formula One Grands Prix, and also participated in several non-championship Formula One races.
 His Formula One debut was on 11 July 1964, at the British Grand Prix at Brands Hatch driving a one-litre, 4-cylinder, Cooper–Ford T73, where he finished fourteenth, 24 laps down, after an extended pit–stop due to a gearbox problem.
 Taylor did not compete in the Formula One World Championship in 1965, but continued to drive in non–championship races.
 He returned to Grand Prix racing in 1966 driving a two-litre Brabham–BRM for privateer David Bridges.
 His first race that season was the French Grand Prix at Reims where he scored his one championship point.
 There followed eighth places at both the British Grand Prix at Brands Hatch and the Dutch Grand Prix at Zandvoort.
The 1968 British Grand Prix was a Formula One motor race held at the Brands Hatch Circuit on 20 July 1968.
 It was race 7 of 12 in both the 1968 World Championship of Drivers and the 1968 International Cup for Formula One Manufacturers.
 The 80-lap race was won by Jo Siffert, his first Formula One victory, and the first victory by a Swiss driver.
The 2015 British Grand Prix (formally known as the 2015 Formula 1 British Grand Prix) was a Formula One motor race that took place on 5 July 2015 at the Silverstone Circuit in Silverstone, United Kingdom.
 The race was the ninth round of the 2015 season, and marked the 70th running of the British Grand Prix, and the 51st time that the race was held at the Silverstone Circuit.