Harper Lee's 'Go Set a Watchman' has knocked down EL James' follow-up erotic novel 'Grey' from top of UK book charts.
The 1950s long-lost novel, written 'To Kill A Mockingbird,' has sold over 200,000 copies in the UK over the past week, which was more than four times the number sold by 'Grey,' the Guardian reported.
The sequel to 'Fifty Shades of Grey,' which had held the top spot for the last four weeks, has suffered drop in sales by 37 percent.
All the publicity has also given a boost to ales of 'To Kill a Mockingbird', with 38,270 copies sold in the last week in print, and almost 70,000 copies sold when digital editions were included.
Meanwhile, The Bookseller said that this week's number one is Lee's first since Nielsen BookScan's records began in 1998.
With this, Lee who lives in Monroeville, Alabama, also becomes the UK's oldest chart-topping writer by over a decade, beating previous record-holder, the then-79-year-old Mary Berry, who was number one with 'Mary Berry Cooks' in March 2014.
According to HarperCollins, the novel has also sold 1.1 million copies in the US and Canada.