The overtime bill at the Crown Prosecution Service has increased nearly 600% since the coalition government imposed cuts on the organisation.
This is how spending on overtime at the CPS has increased in each year of the current government.
The figures were revealed by the solicitor-general, Oliver Heald, in response to a written parliamentary question by Labour's shadow attorney general, Emily Thornberry.
According to the earlier investigation, the service lost 23% of its barristers (202), 22% of its solicitors (518) and 27% (296) of its higher court advocates between 2010 and 2013.
The number of witness care officers and care managers, who are responsible for looking after witnesses in criminal cases, has fallen particularly sharply, by 99 members of staff or 43% since 2010.
Although the number of trials dealt with the CPS fell by 13% during the same period, the rise in overtime suggests the drop-off in work has not been substantial enough to compensate for job cuts.