Fewer than one in ten young managers stick to their working hours even though it affects their social life and damages personal relationships, a survey claims.

Almost nine in ten worked more than their contracted hours, with half putting in at least five hours a week extra.

A poll of 500 managers for the Chartered Management Institute showed concerns about the knock-on effects of the UK's long hours culture.

A third admitted they felt stressed most of the time because of the excessive pressure they were under.

Most of the 25 to 35-year-old managers surveyed said they did not expect to remain in their job for longer than five years, believing there was no such thing as a job for life.

Nine out of ten said they would take action if colleagues were behaving unethically or unlawfully.