A GRANDMOTHER facing execution by firing squad in Indonesia has six months to lodge a final appeal which is "her last hope", her lawyer has said.

Lindsay Sandiford was sentenced to death in Bali in January 2013 for drug trafficking after she was found with cocaine worth an estimated £1.6 million as she arrived on the island.

The 58-year old, from Redcar, who admitted the offences but claimed she was coerced by threats to her son's life, has already seen an appeal fail.

Her legal team are now preparing a fresh attempt to overturn the sentence.

Lawyer Craig Tuck said: "The situation at the moment is that we have a six-month window to file the appeal. Had she filed the appeal earlier it is likely she would have been executed in the previous round of executions."

He added: "Her last hope is this appeal."

He has travelled to Britain to obtain material and consult experts.

"What needs to happen now is that we file the appeal when we are ready," he told the BBC. "We are very cautious about when we file. The timing is critical.

"We want all the information prepared and ready for the court."

He said there is a "great deal of information" that can be put before the Indonesian Supreme Court.

Asked how confident he was, the lawyer said: "This appeal has one of the strongest grounds that I have seen in decades. From start to finish the trial process and appeal process was a train wreck to some extent."

Last month eight convicted drug smugglers, including two Australians, were executed.