This is what we found on Wikipedia regarding the Callum Hole:

Sky Sports Racing (formerly At The Races) is a British pay television channel devoted primarily to horse racing. The channel is operated by ATTHERACES Limited, a joint venture between Sky Group, Arena Racing Company and various racecourses. They also operate the website attheraces.com. The channel broadcasts coverage of domestic, European and international horse racing events. The channel also broadcasts some greyhound racing.

In January 2019, after previously operating autonomously from its sisters, the channel was re-launched as part of the Sky Sports family of channels.