Martin made his senior debut, aged 17, for Great Britain on 3 December 2011, in a 2-1 victory win over Pakistan, in New Zealand. One year later, On 1 December 2012, he made his senior tournament debut for England in a 3-1 defeat against India, in the 2012 Champions Trophy, in Melbourne, Australia. He was the first player who has been involved in England Hockey’s Single System (long term athlete development pathway) to be selected for an Olympic Games. He played in the 2010 Commonwealth Games in Delhi, the 2011 &amp; 2012 Champions Trophy. At the 2012 Summer Olympics, he competed for Great Britain in the tournament. He was also shortlisted for the FIH World Young Player of the Year Award in 2012. On 28 May 2021, he was selected in the England squad for the 2021 EuroHockey Championship.