What set up are you going with?

[Mortblanc]

But our population has treached the point that a "large die off" is not going to leave as much "empty space" as is anticipated.

GB has a population density of 400+ psm.

A die off of 90% will leave 40 psm.

That is still a crowd and probably the population density of most of your rural areas already.

If the "big die off" is restricted to the large cities, as everyone is expecting, then the population of the rural areas will not be too much affected and there will still be plenty of folk to harass you BP.

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On top of that a good part of the once urban population will invade your rural haven seeking space to farm and live.

And London is not going anywhere. It has been there for 2,000 years and will be there after the next plague pases. Same for most of your other major cities. They exist for a reason, usually as trade centers.

If they were trade centers in the last TEOTWAWKI, usually refered too as the Dark Ages, why would the next TEOTWAWKI be any different?