Terming terrorism and security as challenges before the world, British Prime Minister David Cameron today underscored the need for bringing together various arms of government at one table to deal with it.

"I think it (security) is just going to be one of the challenges of our times... When we are considering, for instance the problems of terrorism, its very important that you have your interior minister, your intelligence services, your policing services, but also your foreign office, your military all round the table considering what has happened with this terrorist attack. Including, for instance, the terrorism you suffered here in Mumbai," he said.

Cameron was responding to a question on what have been some of the challenges before his leadership and lessons he learnt as prime minister during an interaction with the staff of Hindustan Unilever, the Indian unit of British consumer products giant, Unilever.

"What does it mean for India? What does it mean for Britain back home? How can we work with you bringing everyone together? And I would like to see more ways that we do that," he said.

Maintaining that there was need to bring the bits of government together, Cameron said, "Otherwise governments, rather like companies worked in the 60s. You... Had silos. So sales didn't talk to marketing, marketing didn't talk to research, research didn't talk to merchandising and so on. Government could be like that."

Drawing a parallel between the London Olympics and Commonwealth Games in New Delhi, he said, "Olympics... That was an enormous task just as you had here with Commonwealth Games trying to make sure that really big events are safe in a dangerous and difficult world. And the amount of time spent as a prime minister on the problems of security, terrorism... I knew it would be big. But it's been even more than expected."

Calling for adopting smarter means to deal with terrorism and security while hosting big events, he said, "You obviously have to put a very strong security response to these things. But you have also got to be more creative, more imaginative and think as well about how we can get different communities to live and work together."