The 1988 Autosport 1000 km was owned by what media company?
1988 1000 km of Silverstone: The 1988 Autosport 1000 km was the fourth round of the 1988 World Sportscar Championship season. Autosport:  In 2016, Haymarket Media Group sold Autosport and other motorsport media outlets to Motorsport Network.
Haymarket Media Group