BNP leader Nick Griffin will not face any action after he published the address of a gay couple who won a landmark legal ruling on Twitter, police told the BBC.
The MEP published the address of Michael Black and John Morgan on the social networking site and called for a demonstration to be held outside their home.
Following a police investigation and advice from the Crown Prosecution Service no criminal offences were identified.
More top news
Freezing, frosty, & icy for some tonight
Voters in some of Britain's most scenic towns and villages share what matters most to them in the countdown to the June 8 national poll.
Police investigating the 2015 general election expenses of Craig Mackinlay have submitted a file to prosecutors.