Some experts, however, conclude that the addition of coalition warships, diplomatic working groups and private security firms, increases complexity and further confuses ship owners looking for simple solutions.

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Tackling the question of transferring a share of the UK's debt, the experts consider several options and conclude it should be "gradually transferred" as bonds mature and need rolled over, saying this would be a "sensible and efficient solution".

BBC: Scottish independence: Scotland 'should keep Sterling'