Lindsay Sandiford could seek a judicial review if Indonesia's Supreme Court rejects her latest death penalty appeal, human rights campaigners have said.
However, such a move would largely depend on whether new evidence had come to light, they added.
After that, her final resort would be to seek a reprieve granted by the country's president.
More top news
It will be a cold start to Wednesday across many southern areas but with some early sunshine to enjoy.
Ambulances are struggling to hand patients over to A&E departments within target times, MPs warn.
Zac Goldsmith hopes to be reinstalled as Tory MP for Richmond Park - months after he quit the party and forced an unsuccessful by-election.