Prime Minister David Cameron will send a strong message to Colombo to improve its rights record and show a commitment to good governance, said British High Commissioner to Sri Lanka John Rankin.
"The British government will come with a clear message that Sri Lanka needs to make concrete progress on human rights, reconciliation and a political settlement," Rankin told the Foreign Correspondents' Association in Colombo.
Canadian Prime Minister Stephen Harper is boycotting the three-day Commonwealth Heads of Government Meeting (CHOGM), which begins November 15, over alleged crimes and rights abuses during and after Sri Lanka's civil war.
Rankin declined to comment on Canada's boycott, but made it clear Britain's participation at the summit was not an endorsement of the host nation.
Cameron will travel to Sri Lanka "because of the importance we attach to the Commonwealth, irrespective of the location of the CHOGM", he said.
There was no immediate comment from Sri Lanka's government, but the main minority Tamil party, the Tamil National Alliance (TNA), said it wanted Cameron to visit the former war zone during the CHOGM.
"We want Britain and the CHOGM to take up accountability as a main issue."
Rankin said they were still working out Cameron's schedule he would have "several engagements with Sri Lankan civil society".
He said the spotlight on Sri Lanka during the 53-member bloc summit would help pressure the island to demonstrate its commitment to "Commonwealth values" of good governance.
"We are also concerned about wider issues of respect for human rights, rule of law and independence of the judiciary in Sri Lanka," he said.
A British MP, Simon Danczuk, had urged the Queen to boycott the Colombo CHOGM to protest the lack of progress in a probe into the murder of his constituent, Khuram Sheikh, in Sri Lanka on Christmas day in 2011.
UN rights chief Navi Pillay warned Colombo last month to show "clear progress" towards reining in rights abuses and investigating suspected war crimes by next March, or face an international investigation.
