Page 8 and finally someone gets it.The real elephant is reluctance to recognise that this wouldn't be a bit of boy scout fun playing at self-sufficiency. Survival would have nothing to do with ability to make fires by rubbing sticks together or learning how to smelt metal. For the first 50 years survival would be by membership of one of the murderous gangs and managing to be useful enough to one of the ruthless gang leaders so that he spared your life.
I have been laughing at all the ex. boy scout free bus pass holders talking about bunny rabbits and making rope, while disparaging the Facebook generation. The Facebook generation will eat you metaphorically or literally.
Essentially if you are over 55 you have had it as the UK population drops 90% within a year. In a broken primitive society executive power is held by those between 40 and 50.
Our destroyed society would leave behind vast amounts of material goods so no one will have to fabricate rope for 50 to 100 years. Survival comes down to control of the abandoned material wealth. Years 50 to 200 would be interesting as a world population of 1 billion re-advances quickly based on prior knowledge but in a world where the easy natural resources were extracted a 100 years before.
In practice the apocalyptic collapse is unlikely instead we will see a quick decline in UK living standards not replicated everywhere else. Expect a political schism in the UK based on an intergenerational divide within 10 years and emergency food parcels from Australia within 20.