The Ministry of Defence has been scouring Britain for places to build at least six new munitions factories as part of a 6bn programme to increase its supplies as part of a Nato-wide rearmament push. Emails released to the Ferret website show the MoD, the Department of Business and Trade and the Health and Safety Executive believe that at least four sites at Grangemouth, where the UK's oldest oil refinery closed earlier this year and several chemical companies have shut down, could be suitable.