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Just one other thought.
If the UK cancelled its £12 bn overseas aid budget, you could pay for Boris Island in four years. Yes, you could pay for a new airport, plus a new TGV rail system all over the country, plus new roads and port facilities, all within 10 years. (£120 bn worth of infrastructure projects.)
But NO - prime minister Ca-Moron wants to give this money to despotic tyrants instead, so they can buy more weapons and oppress their people (and purchase more amfo trucks and semtex vests to be exported back to the West, as a small token of their thanks).
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