Question: The 1988 Autosport 1000 km was owned by what media company?

Context paragraphs:
2008 1000 km of Silverstone: The 2008 Autosport 1000 km of Silverstone was the fifth and final round of the 2008 Le Mans Series season.  It took place at the Silverstone Circuit, Great Britain, on 14 September 2008.  The race was attended by a record crowd of 53,000 spectators.

Autosport: Autosport (ISSN 0269-946X  ) is a weekly magazine covering motorsport, published in the United Kingdom every Thursday.  It was first published on 25 August 1950 by Gregor Grant, immediately prior to the Silverstone International Trophy meeting of that year.  In 2016, Haymarket Media Group sold Autosport and other motorsport media outlets to Motorsport Network.

2009 1000 km of Silverstone: The 2009 Autosport 1000 km of Silverstone was the fifth and final round of the 2009 Le Mans Series season.  It took place at the Silverstone Circuit, England, on 13 September 2009.  The race was won from pole position by Olivier Panis and Nicolas Lapierre for Team Oreca, while the third-place finishing Aston Martin of Jan Charouz, Tomáš Enge and Stefan Mücke won the LMP1 championship.  Speedy Racing Team Sebah won their first race in the LMP2 category while the ASM Team failed to finish but were able to win their championship.  First-time LMS entrant Gigawave Motorsport led the GT1 category while JMW Motorsport won in GT2.  Team Felbermayr-Proton secured the GT2 class championship by finishing in seventh in their class.

2010 1000 km of Silverstone: The 2010 Autosport 1000 km of Silverstone was the fifth and final round of the 2010 Le Mans Series season and the inaugural race of the Intercontinental Le Mans Cup.  It take place at Silverstone Circuit on 12 September.  Manufacturers in the LMP1 and GT2 categories are eligible to compete for points in the ILMC, will designated teams in all categories except Formula Le Mans are also competing for an ILMC title.

1970 1000km of Monza: The 1970 1000 km of Monza was an endurance race held at the Autodromo Nazionale Monza, Monza, Italy on April 25, 1970.  It was the fourth round of the 1970 International Championship for Makes.  This was the first official 1000 km race at Monza that used only the road course; in 1956 and 1965-1969 the organizers utilized the combined road and banking courses; but the banking was abandoned because of safety issues; the 1969 1000 km race was the last race ever held on the concrete-surfaced banking.  Mexican driver Pedro Rodríguez won this race in John Wyer's Gulf-sponsored Porsche 917K, he was able to hold off 3 hard-charging works Ferrari 512's after his co-driver Leo Kinnunen lost most of the lead Rodríguez had built up.  Ex-Ferrari driver John Surtees returned to Ferrari after 4 years to drive a works 512.

1000 kilometrų lenktynės: ENEOS 1000 kilometrų lenktynės (English: ENEOS 1000 km race , formerly known as "Horn Grand Prix", "TV3 1003 kilometrų lenktynės" and "Omnitel 1000 km lenktynės" for sponsorship reasons) is a touring car and GT endurance racing event held annually in Lithuania, at Palanga circuit , two kilometers away from the resort town of Palanga.  The race was first held in 2000.

1988 1000 km of Silverstone: The 1988 Autosport 1000 km was the fourth round of the 1988 World Sportscar Championship season.  It took place at the Silverstone Circuit, United Kingdom on May 8, 1988.

2009 Suzuka Pokka GT Summer Special: The 2009 Suzuka Pokka GT Summer Special was the sixth round of the 2009 Super GT season and was the 38th running of the 1000 km Suzuka event, although for the first time since 1969, the race was not 1000 km in length as in a bid to reduce CO emissions, the race distance was shortented to 700 km.  It took place on August 23, 2009.

1992 Fuji 1000km: The 1992 Fuji 1000 km was the fifth round of the 1992 All Japan Sports Prototype Car Endurance Championship season.  It took place at Fuji Speedway, Japan on October 4, 1992.  This race was the last 1000km race at the circuit until the 1999 Le Mans Fuji 1000km.

1000 km Zeltweg: The 1000 km Zeltweg (originally known as the 500 km Zeltweg) was an endurance sports car event held near Zeltweg, Austria.  Originally based at the Zeltweg Airfield, the race moved to the Österreichring and was lengthened to a 1000 km distance and there it continued to be a regular event in the World Sportscar Championship until 1976.

Supporting paragraphs: 1988 1000 km of Silverstone Autosport
Answer: Haymarket Media Group