The Prison Reform Trust has hailed last week's European Court of Human Rights ruling as a "massive boost" to its campaign to give all prisoners the vote.
The Strasbourg court ruled that the UK Government's ban on prisoners voting breached the human rights of a man serving a life sentence.
The victory represents early progress for the trust's 'Barred from Voting' campaign, which it launched with ex-offender charity, Unlock, last month. It aims to reverse the 1870 law which precludes serving prisoners in the UK from voting in local, European or Parliamentary elections.
"This judgement is a massive boost to our campaign," said Enver Solomon, the trust's senior policy officer. "It reflects that the law has to be changed, but there is a long way to go to ensure that this ruling doesn't just remain a European judgement that was made and lost."
Solomon said he expected the Government would set up a committee "that will take forever to make a decision. Our job is to apply pressure to ensure that this issue isn't kicked to the fringes."