Relatively new to actually "doing something" about prepping, although been thinking about possible breakdown scenarios and likely play out of events for several years. I recognize that short term events at local, regional or even national level are probably the most likely thing we need to deal with every five years or so maybe, however... If SHFT...
I do believe that if we consider a 30 year timescale out to 2050 that it is inevitable that "something(s)" will happen that result in human population globally being reduced to around 1B, equivalent to circa 1800-1850. Whether that is due to our own stupidity, our lack of ability to change our behavior or fighting amongst ourselves over the scraps that are left. A perfect storm of population growth, climate change, sea levels, north Atlantic current, pollution, increasing energy use and heat release into atmosphere, peak oil / shale resource depletion, economic stagnation, or expansionist countries looking outside their borders for resources - I fear as a species we collectively will put our heads in the sand or refuse to change until we are past a point of no return when it is too late to effect change. If money would not be worthless at the end of the day, it is nearly worth putting a bet on the Apocalypse happening
I also think the UK faces some local / regional / national near term challenges, global weather wierding / jet streams in the wrong place increasing the extremes of drought, flood, arctic winters, lack of political direction on replacing aging power generation infrastructure that is immanently end of life, rising power consumption with decreasing spare capacity, economic challenges / political / nationalism - events from which normality is potentially recoverable and avoiding complete SHTF collapse.
Of course their are all the other things are are overdue for that are totally out of human control with... ice age, super volcano, comet, evil brain sucking aliens, gamma ray burst, polar flip, coronal large mass ejection, wandering black hole... the list goes on and on and tends to be the sort of thing which is global game over I guess - not much prepping you can do against a gamma ray burst or black hole destroying the planet so I don't bother worrying about these sorts of scenarios
So I guess my paranoia / psychosis is still in check and my wheels haven't fallen off 
What I worry about in my planning is the best way, when that big SHFT event between now and 2050 happens, what the most effective way would be to hide and avoid people in UK until there were 90 to 95% less people to worry about. The UK centric smaller events that are not SHTF grab the weapons and guard the battlements, where you hunker down - I feel prepared for and that I could Bug In and ride out.
It is when we have the armed gangs of looters and starving hordes beating on doors with social law and order having collapsed... what then... In or Out, when do or should we have jumped.
