Tributes are flowing for South Australian Kirsty Boden who lost her life rushing to help victims of the London terror attack.

Kirsty Boden has been remembered as a "hero", someone who "lit up the room" and "one in a million" as tributes begin to flow for the South Australian nurse, one of two Australians confirmed killed in the London Bridge terrorist attack.

Ms Boden, 28, from Loxton, has been described as a wonderful nurse by her work colleagues, and a kind, caring and generous person by others who knew the former champion swimmer.

Ms Boden was among seven people who died in the attack on London Bridge and nearby Borough Market on Saturday night.

"As she ran towards danger, in an effort to help people on the bridge, Kirsty sadly lost her life," the family said in a statement issued through London's Metropolitan Police.

"We are so proud of Kirsty's brave actions which demonstrate how selfless, caring and heroic she was, not only on that night, but throughout all of her life. Kirsty - we love you and we will miss you dearly.

"Kirsty was loved and adored by her family, friends and boyfriend.

"She was the most outgoing, kind and generous person who loved to help people. Helping people was what she loved to do in her job as a nurse and in her daily life."

Dame Eileen Sills, chief nurse and a member of the board at London's Guy's and St Thomas' Hospital, where Ms Boden worked in theatre recovery, described her as an outstanding nurse and a truly valued member of the team.

Dame Eileen says staff remember their colleague as "one in a million" who always went the extra mile for the patients in her care.

"I cannot put into words how sad I am that we have lost one of our own," Dame Eileen said.

Members of the Loxton State Emergency Service said she always "lit up the room with you're (sic) adorable smile and gorgeous laugh".

"You are a true everyday hero, putting the needs of those injured before yourself," they said on Facebook.

Immanuel College principal Kevin Richardson said the former student was a border and a star swimmer who always wanted to travel.

"She was a very caring person. One of those kids who basically had a great passion for life and wanted to live every moment," he told ABC radio.

Former schoolmate, Donshae Kaesler said Ms Boden was "always so bubbly at school".

"You will be sadly missed," she said.