After Society Collapses.

[Ghost]

I'd stay low for a while but then go off for a little scout about.
How far I would go would all depend on the current state of the surrounding countryside and how feral the locals may have gone.
As Scythe points out it would be difficult to guarantee a good steady food supply and this would limit how far you could reach before it became too dangerous.
In a Cosy catastrophy it would be spring and there would be an abundance of lightly looted tescos to make my country wide journey an adventure! But I doubt that it will be anything like that :-(