The stadium Jumping phase has already started. Lower-placed riders and horses will compete this morning. The top 20 riders and their horses will start to compete this afternoon at circa 1:30 British time. You can check Twitter to get exact info.
You can follow on Twitter:
@ancce_eventing (Italian) @NZEventing (New Zealand Eventing) @HorseAndCountry (From the UK).
You can also follow the Badminton Horse Trials Page on FaceBook: https://www.facebook.com/BadmintonHorseTrials
Badminton Horse Trials picture galleries and information at these links: