Tatts Group Limited, formerly known as Tattersalls, is the name of a company in Australia that helps people to bet money. Tattersalls has made lots of money. A woman named Helen Harvey owned Tattersalls and had lots of money. When she died, she gave the money to her friend Martin Bryant. When Bryant went to jail after he killed people in the Port Arthur massacre, he had to give all of the money to people who were killed or injured there.