Almost one in ten admits spending up to three hours outside their normal working day checking work emails, and even those without a smartphone check emails on their home computer.

Some workers confess they are on call almost 24 hours a day, with nine out of ten saying they take work emails and calls outside their normal working hours.

Nearly two-thirds say they often check work emails just before they go to bed and as soon as they wake up, while over a third have replied to one in the middle of the night.