In Cable's argument, leaving NATO could reduce some threats to Britain, but that expectation depends on uncertain reactions abroad. Air power might deter an invasion while leaving the country's seaborne trade exposed to interference. A smaller naval power could exploit that vulnerability as well as the Soviet Union. He therefore connects an independent foreign policy with the means to protect maritime trade. His proposed use of savings from a reduced continental commitment is to strengthen the navy.
Notable Point · 2:41:24-2:42:10
Cable on independent foreign policy and seaborne trade
Cable argues that protection against invasion would still leave Britain's trade vulnerable if NATO withdrawal also meant abandoning an ocean-going fleet.