In his congratulatory message released by Downing Street here, Cameron expressed hope that the issues of the past will be addressed.
In his statement, he said, "I congratulate Maithripala Sirisena on his victory in yesterday's Presidential election. When I visited Sri Lanka I saw the huge potential the country has, and wish him well in taking every opportunity to help realise this potential and lead a stable, prosperous, united country".
"These peaceful, democratic elections are a credit to all those involved and the people of Sri Lanka. I welcome the fact that outgoing President (Mahinda) Rajapaksa has accepted the democratic will of the people and committed to ensuring a smooth transfer of power.