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The last days behind bars of a British drug mule gran, who spent 12 years on death row for smuggling £1.6million of cocaine into Bali have been revealed. Lindsay Sandiford , 69, was locked up in Bali's notorious Kerobokan jail after she was sentenced to the death by firing squad for smuggling cocaine into Indonesia, in 2012. The Brit, then 56, claimed she was forced by an international drug syndicate that threatened her family if she refused. The frail gran faced over a decade in brutal conditions at the jail before a deal was struck between Keir Starmer and the Indonesian authorities for her release, on humanitarian grounds. The notorious jail released images of the nan's final hours in the prison , before she boarded a £600 UK government paid flight back home, arriving at Heathrow on Friday. Sandiford was seen hugging pastor Christine Buckingham, who supported her behind bars, in a warm embrace. The pastor, speaking to The Mirror , revealed the 69-year-old was in a frail condition and was suffering with health issues, after over a decade locked up. She said: "She is in extremely ill health and she's very keen to get back and be with her family after these 13 years. She wants to get home and enjoy some creature comforts." Indonesian authorities said the gran is suffering from diabetes and hypertension, so needs medical attention on home soil. Buckingham added: "She's very unwell. The most important thing is that she gets home. We need her to be checked medically, and then the plan is that she says she will spend as much time as she can with her family." The pictures released from the Kerobokan jail also showed the gran with her head in her hands, covering her eyes, while officials from the British and Indonesian government signed a treaty. Sandiford then got into a white passenger van while a crowd of people watched on and took pictures, at the jail. The grandmother was pictured back in the UK after she landed at London Heathrow Airport on Friday, after a 20-hour journey. She was seen in a wheelchair and shielded her face from photographers outside Terminal 4. Authorities in Indonesia claim she will spend more time behind bars upon her arrival in the UK - although the Foreign Office has refused to say if Sandiford will be taken into custody. Sandiford was freed alongside fellow UK national Shahab Shahabadi, 35, who was detained in June 2014 and is serving a life sentence for different drug offences. The two were released as part of the deal between British and Indonesian authorities, signed in front of Saniford. The repatriation deal was signed by Foreign Secretary Yvette Cooper on October 21 after months of talks, officials said. Indonesia's Deputy Minister for Immigration and Correctional Coordination, I Nyoman Gede Surya Mataram, said: "This process demonstrates Indonesia's credibility in the international legal cooperation scheme."