British survey: Smartphones, tablets adding two hours to the working day on average

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.