Foreign Affairs Minister Mangala Samaraweera was also present during the dialogue, the country's main Tamil party Tamil National Alliance (TNA) said in a statement today, welcoming the move.
"The Global Tamil Forum (GTF) continued their informal dialogue over the last two days in London with various stakeholders to enhance confidence building measures between all communities within and outside Sri Lanka," the party said.
It said the need for constructive engagement by the Sri Lankan Diaspora was discussed, including the needs of displaced people.
"The release of prisoners held under the Prevention of Terrorism Act (PTA) in the light of the review by the Ministry of Justice was also discussed. The TNA and the GTF further raised the issue of listing of Diaspora organisations and individuals by the previous government.
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"Ideas of ways in which the Sri Lankan Diaspora could assist by bringing its exceptional capacity and capabilities were explored," the release added.
The rights body is due to present its report on the international investigation into alleged war crimes blamed on both government troops and the LTTE during the nearly three decade-long war.
The previous regime of Mahinda Rajapaksa had designated some 424 individuals and 15 Tamil diaspora organisations as terrorists and terror groups, respectively, in 2014.
The new government has pledged to review the list in the light of some goodwill measures taken to address Tamil grievances.