No Conservatives will face charges for breaches of expenses rules over the 2015 general election “battle bus”.
The Crown Prosecution Service said it had examined files from 14 police forces and while there was evidence of inaccurate spending returns it did not “meet the test” for further action.
It is still investigating the Conservative campaign in South Thanet.
The Conservatives said the allegations had been “politically motivated” and a “waste of police time”.
The inquiry related to claims some “battle bus” campaigning costs in the 2015 election were wrongly recorded.