The government has committed to raising the minimum legal age of marriage to 18 in England and Wales in a victory for campaigners. Currently, 16 and 17-year-olds can marry with parental consent, but a coalition of charities has warned that this legal loophole is being exploited to coerce young people into child marriage. In a letter to campaigners from the Ministry of Justice, shared with the Guardian, it said it was committed to raising the minimum legal age to 18 “as soon as legislative opportunity arises”. The news came as Sajid Javid, the former chancellor, told the Times he would introduce a private member’s bill next week making it illegal for under-18s to marry. Last month, the four co-chairs of the coalition Girls Not Brides UK wrote a letter to the prime minister warning that the current law on forced marriage law did not go far enough to protect young people. The Conservative MP Pauline Latham has recently held meetings with ministers, including the justice secretary, Robert Buckland, to discuss the issue, including a proposal for a new criminal offence for adults who aid, abet or procure marriages for children. On Thursday, a justice minister, Lord Wolfson, wrote to the Iranian and Kurdish women’s rights charity IKWRO; Karma Nirvana, which campaigns against forced marriage; Forward, an African women-led organisation working to end gender violence; and the Independent Yemen Group; saying: “The government supports raising the legal age for marriage in England and Wales to protect vulnerable children living here. “[It is] committed to making sure children and young people are both protected and supported as they grow and develop in order to maximise their potential life chances. This includes having the opportunity to remain in education or training until they reach the age of 18. “Child marriage and having children too early in life can deprive them of these important life chances.” The letter said the department would consult with the Home Office on whether a new criminal offence was needed or whether the existing law on forced marriage could be amended. Natasha Rattu, director of Karma Nirvana, which has protected girls as young as 11 from child marriage, said: “We are delighted that after relentless campaigning the government has listened to our joint calls to end child marriage by committing to raising the legal age to 18. “But while this is a huge step in the right direction, it remains imperative the government also makes child marriage a crime. “This would ensure maximum safeguards against all forms of child marriage and sends out the strongest possible message that child marriage is not accepted or tolerated by our government.” Diana Nammi, founder of IKWRO, which has been campaigning to ban child marriage for more than a decade, said the loophole allowing children to marry with parental consent – introduced before the second world war to protect families’ reputations and land – left youngsters vulnerable to parental coercion. “What we need to see now is confirmation from the government of when and how the change in the law will be implemented. There is no time for delay while children in the UK continue to be coerced into child marriage – a harmful and hidden practice that has been exacerbated by the pandemic,” she said. Payzee Mahmod, a survivor of child marriage who was wed in London at the age of 16, said: “While I’m celebrating this news from the government, we now need to make sure every type of child marriage is banned. “It is crucial child marriage is made a crime so young people are protected from every type of marriage, including religious and cultural non-registered marriages, and to prevent British men from marrying children from abroad.” Mahmod’s sister, Banaz, was murdered in an “honour” killing after leaving the husband her family chose for her when she was 17. IKWRO said it was working with other human rights organisations to push for a ban on child marriage in Scotland, where the law allows young people to marry from 16 without parental consent. Latham said she was thrilled at the government’s response to her calls to end child marriage. She introduced a bill last year to raise the minimum legal age of marriage but its progress was stalled by the Covid-19 pandemic. “I hope the government’s legislative proposals will eliminate child marriage in the UK and send a clear message to other countries that the practice cannot be tolerated,” she told the Guardian.