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By Kylie MacLellan and Sarah Young
LONDON, Nov 23 (Reuters) - Britain will boost spending ondefence to combat the growing threat from Islamic militants,Prime Minister David Cameron said on Monday, underlining theneed for rapid reaction forces after the Paris attacks.
After visiting Paris where he pledged British support forFrance after the Nov. 13 attacks which killed 130 people,Cameron unveiled plans to increase spending by 12 billion pounds($18 billion) to 178 billion over the next decade as part of hisgovernment's five-year defence and security plan.
But the review, which detailed plans to buy eight BAEwarships and nine Boeing maritime patrol aircraft, also saidBritain would need to cut civilian staff at its defence ministryby 30 percent to help keep the government's budget in check.
"As the murders on the streets of Paris remind us so starklyISIL (Islamic State) is not some remote problem thousands ofmiles away, it is a direct threat to our security at home andabroad," Cameron told parliament.
Detailing a list of new purchases, more financing forintelligence agencies and the targeting of the aid budget tosupport broken states, he said: "Not one of these capabilitiesis an optional extra, these investments are an act of clear-eyedself interest to ensure our future prosperity and security."
Britain needed to be able to rapidly respond to crises asthey emerged, and that as such the government would put in placea new contingency plan to deal with terror attacks, making10,000 military personnel available on standby.
The review highlighted that passenger jets were a primarytarget for militant groups and that some, including IslamicState and Al Qaeda, would try to acquire chemical, biologicaland radiological capabilities.
EQUIPMENT ORDERS
Cameron said Britain would buy nine Boeing P-8Poseidon submarine-hunting aircraft to help protect its nucleardeterrent and fill a gap left by a much-criticised decision toscrap the Nimrod spy-plane programme in 2010.
The move to buy the converted 737 passenger jets follows anintense lobbying campaign by Boeing's rivals including AirbusGroup, Finmeccanica and Lockheed Martin to try to persuade thegovernment to run a competition for maritime patrol aircraft.
The government also said it would buy at least 13 newfrigates for the Royal Navy, eight of which will be the "Type26" warships which BAE Systems is designing, with theremainder a new class of cheaper, more flexible vessels.
Cameron announced Britain would create two rapidlydeployable, 5,000-strong "strike brigades" by 2025 and extendthe life of its Typhoon fighter jets by 10 years to create anextra two squadrons.
It will also invest in new surveillance drones andaccelerate the purchase of Lockheed Martin's F-35Lightning II jets, with 24 due to be in place on Britishaircraft carriers by 2023 as part of a total order of 138.
In the review, the government raised the estimated bill forreplacing Britain's nuclear submarines to 31 billion pounds, 6billion more than an earlier estimate.
It did not detail the maintenance costs for Trident, which the government has suggested will be about 6 percent of theannual budget over the vessels' lifetime. That could take thetotal cost for maintenance and renewal to well over 150 billionpounds. (Additional reporting by Tim Hepher, editing by ElizabethPiper)