Martial law.

[Jack]

Actually BP all three have contingency plans yes, but the army are of prepping mentalities also. London will be held (golden mile) but instead of the manchesters / glasgows etc you'd see the green machines roll into Bristol, Exeter st David's, Plymouth most certainly, among others. Reason being is they are each large network/transport hubs but have comparatively low populations to other locations with the same resources. So post serious events the minimum of collateral damage would be achieved... Meaning less of our own blood on our militarise efforts to keep 'national interests national'.
As for hospitals and dockyards no, the army control their own medical supplies and equipment/field hospitals and would only want hosps within the area of occupation if at all.

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Dockyards like Plymouth have their own tactical advantages and resources.