The government has won Commons support for plans to renew the UK's nuclear submarine system, despite a large rebellion by Labour MPs.
Tony Blair had said it was "essential" the UK began the £20bn plan to renew Trident as soon as possible.
After six hours of debate, 409 MPs supported the proposals, and 161 were against - a majority of 248.
Earlier 413 MPs had rejected a bid to delay the decision, with 95 Labour rebels among 167 MPs wanting a delay.
Rebels included 16 former ministers, including four ex-Cabinet members.