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[deleted] t1_ixsabyv wrote

Not really.

When Hervy II build up Dover castle to basically it's current state (of course minus the gun batteries added centuries later) the cost was ~6500 pounds - with total yearly income being ~10000.

Total tax intake in GB today is ~720 billion pounds - so a fortification equally expensive (65% of yearly tax income) wouldn't merely be "multi-billion" but much more.

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