The Help and Bravo two zero although both of those are based on real stories.
Most read novel would be The Green Mile
Can't say that any of the classics mentioned here draw me back to them. However I do dust off the novels of Tom Sharpe about every 10 years and re-read
The Qur'an.
Thurber's short story "The Secret Life of Walter Mitty" and Keith Waterhouse's novel "Billy Liar" both of which were lent to me by my pal Kempo.