British Prime Minister David Cameron said it will vote in favour of the resolution on Sri Lanka at the upcoming United Nations Human Rights Council that has been moved by the US.
Cameron said he wanted to see reconciliation in the country.
Regarding an international probe into war crimes against Sri Lanka, Cameron said "The UN Human Rights commissioner has called for this and that is what a UK co-sponsored resolution at the UN Human Rights Council supports."
Welcoming the progress which has been made by Sri Lanka in areas like reintegration of child soldiers, demining and reconstruction, the UK said it strongly believes "that, without a credible investigation, it will be difficult to move forward in the true spirit of lasting peace, reconciliation and unity.
47 countries are eligible to cast their vote at the UNHRC.