Police forces in the UK will probe the double murder of David Miller and Hannah Witheridge in the island resort of Koh Tao, Thailand.
UK detectives were cleared to work on the case after Thailand military dropped objections to that respect.
Miller and Witheridge were found brutally murdered on a beach in Koh Tao last month. Two Burmese men were arrested in connection with the case and allegedly confessed to the crimes.