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The story telling part of his brain remained "until the very end", says Sir Terry Pratchett's best friend and personal assistant Rob Wilkins.

Speaking to 5 live after the release of Sir Terry's last book in his Discworld series, Rob said the novel had been a "giant literary jigsaw" to piece together after the author's death.

The hugely popular author died in March at the age of 66 - eight years after being diagnosed with Alzheimer's disease. "The Shepherd's Crown" is the 41st book in his Discworld series.

This clip is originally from 5 live Breakfast on Thursday 27 August 2015.