The lead singer of heavy metal band Napalm Death has written an open letter to the president of Indonesia, appealing to him to spare the life of a British woman facing the death penalty for drug-smuggling.

The letter calls on President Joko Widodo, a fan of the band and the heavy metal genre, to show mercy and restraint.

Lindsay Sandiford, who was sentenced to death by firing squad following her conviction, claims she was forced to carry the illegal cargo by dealers who threatened the lives of her children.

Speaking to the BBC, Napalm Death lead singer Mark "Barney" Greenway explained why he had written the letter.