Prisoner vote ban 'breaches human rights'
A group of 1,015 offenders brought cases to the European Court of Human Rights, which has previously deemed a blanket ban on prisoner voting unlawful.
The ECHR rejected claims for compensation and legal costs, however.
Ukip MEP Diane James, who is the party's justice spokeswoman, accused the ECHR of "unwarranted interference in a national issue".
She added: "This case highlights that a foreign court with inexperienced judges has final say over the British justice system. The ECHR has not pulled back one inch in demanding its right to be the final judge."