"The UN ought to include India in the Security Council as a permanent member," Cameron told an interactive session with students of the Indian Institute of Management, Calcutta, here.
"It is important that the Security Council demonstrated its political will in this regard," he observed, adding "What matters most is the political will."
"UN as an institution is not perfect, but a worthwhile organisation. It should modernise itself as well," Cameron said.
He said that each nation should back the UN and see that its functioning improves.
"We will try to make the most of it from the meet. We will drive the UN to do that," he added.