Scrapping the Trident nuclear missile system would save £83.5bn and many of the jobs at risk could be transferred to alternative defence projects, according to an authoritative study published on Wednesday. An average annual saving of £1.86bn would be made until 2062, it says. The study, commissioned by senior figures from all three main parties, points out that the savings would not be available immediately because cancellation and decommissioning costs would have to be taken into account. The report, by Professor Keith Hartley, a leading defence economist, is published by a commission set up by the British American Security Information...