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Copies of Harper Lee's eagerly awaited novel Go Set a Watchman are now on sale in UK bookshops.

The book is set 20 years after the events of Lee's 1960 Pulitzer Prize-winning novel To Kill a Mockingbird, but was actually written beforehand.

Go Set a Watchman follows Scout - now known as 26-year-old Jean Louise - as she returns to her Alabama hometown from New York.

It is the most pre-ordered book title on Amazon since the final book of the Harry Potter series. ÃÛÑ¿´«Ã½ 5 live's Phil Williams spoke to one of the first people to read the book - Joseph Knobbs - who works at a central London bookshop. He told 5 live that Watchman, "throws new light onto the characters in Mockingbird, which is "fascinating".

"[In Mockingbird] broadly speaking we knew who the good people were and who the bad people were, whereas in this book, as is true to life, there are a few more grey areas," he said.

Publicity-shy author Lee, who is now 89 and living in a nursing home in Monroeville, Alabama, originally wrote To Kill a Mockingbird in 1957, before reworking it with her editor. The story of racism and injustice in the fictional town of Maycomb in the American South went on to sell 40 million copies and be studied in schools around the world.

This clip is originally from Phil Williams on Monday 14 July 2015.

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