22 May 2012
Updated at 16:14 ET
Trident contracts worth £350m unveiled by MoD
The final cost of the replacement submarines is expected to be at least £20bn
Related Stories
Q&A: Trident replacement
Replacing Trident 'nonsensical'
Fact file: Trident missile
The Ministry of Defence has awarded £350m contracts for the next generation of nuclear-armed submarines to BAE Systems, Babcock and Rolls-Royce
link-
http://www.bbc.co.uk/news/uk-18155835