why cities will become lawless shortly after major event

[Timelord]

that may happen in the cities or very large towns, but local councils are so underfunded and wishy washy these days that it wont happen, we have said before that even with Army and Police in attendance the numbers are so low they wont be able to police the whole country but will concentrate on the capital and 1 or 2 of the larger cities(Birmingham & Manchester?).
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Hello BP. That is right but it will all depend how fast the situation unfolds. Don't forget that it will be other government organisations that will be requisitioning supplies. Some of those supplies may include fuel or gas supplies from less populated areas to attempt to relieve the more populated ones. If the situation continues to deteriorate, then that may directly impact a diverse catchment area.