United Kingdom to significantly boost defence spending

Our allies are asking us to do this and the case for doing so has only grown stronger after the Paris attacks. [It is also introducing new standards on the assessment of security arrangements for cargo flown into the EU-Ed].

The SAS and SBS will crucial in Britain's response to any terrorist attack.

He said the terror spree in the French capital "was the sort of thing we warned about" in planning with the security services but such atrocities meant "you have to go right back to the drawing board" to work out what more steps needed to be taken.

"The attack in Paris was a coordinated attack, a planned attack, an attack on a larger scale", she said.

The government next week will publish the Strategic Defence and Security Review, while Cameron is to later meet with Russian President Vladimir Putin (their first face-to-face meeting for a year) in an attempt to urge Putin to co-operate with US-led coalition forces battling Islamic State militants.

He will also confirm that there will be a 15 per cent increase in the number of security agents working for MI5, MI6 and GCHQ in the wake of the attacks in Paris last Friday. And tomorrow, the National Security Council will discuss the Government's policy on aviation security.

This new funding will provide extra aviation security experts to assess security at airports around the world and train and equip other countries so as to help them increase security at airports.

Unsourced British media reports said special forces were dressed in plain clothes and supporting police at busy public locations, including train and metro stations, shopping centres and popular entertainment districts.

The Government is to recruit 1,900 security and intelligence agents and double spending on aviation security in response to the terror threat from Islamic State.

The Russian president began an air campaign in Syria in late September to support President Bashar al-Assad, whom the British prime minister has said must give up power. Since 2010, we have taken the tough decisions necessary to restore our economic strength and we now have one of the fastest growing developed economies.

"I am determined to prioritise the resources we need to combat the terrorist threat because protecting the British people is my number one duty as prime minister", Cameron said yesterday.

"This is a generational struggle that demands we provide more manpower to combat those who would destroy us and our values", Cameron said. "It's our bread and butter", said one military source.

Speaking in London after attending a meeting of G20 leaders in Turkey where security issues dominated, Cameron said Britain would demonstrate the same resolve in the fight against terrorism it showed against Nazi Germany in World War Two.

The man sought by the authorities is believed to have rented the black Volkswagen Polo used by a group of hostage-takers that left at least 89 people dead inside the Bataclan concert hall.