A British grandmother who was facing execution by firing squad has arrived back in the UK.

Lindsay Sandiford was sentenced to death on the Indonesian island in January 2013 for drug trafficking after she was found with cocaine worth an estimated £1.6 million ($A3.2 million) as she arrived.

The 69-year-old, admitted the offences but claimed she was coerced by threats to her son's life.

Images published by the Daily Star and Metro appear to show Sandiford in a wheelchair and covering her face with a jumper outside Heathrow Airport on Friday.

Last month, an agreement to repatriate her, alongside fellow British national Shahab Shahabadi, 35, was signed by Foreign Secretary Yvette Cooper and Indonesia's Senior Minister of Law Yusril Ihza Mahendra.

Both Britons have suffered severe health d

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