The National Security Council said in a strategy report much more emphasis is needed to spot emerging risks and deal with them before they become crises, The Daily Telegraph reported.
Al-Qaida remains the "principal current national security threat," the document said but added new ideologies could cross the line between advocacy and terrorism.
"It is a realistic possibility that in the next 10 years, extremists motivated by new ideologies or narratives could cross the line between advocacy and terrorism," the National Security Strategy report said.
The document lists the top threats to Britain as international terrorism and Irish terrorism, attacks in cyberspace, a military crisis between states and a major accident or natural hazard such as a flu pandemic.
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