Well hypothetically if the current population of the UK is 60,000,000 and if hypothetically all but 1% died that would leave something like 600,000 people alive.
So hypothetically there is a weeks supply of food per person in the UK at any one time that would be the equivalent of 59,400,000 weeks worth of food for those 600,000 to scavenge.
Of course this would depend on the time scale the hypothetical die off took, Also much of the "fresh" food would go off, and food in freezers wouldn't last, but with the availability of tinned, dried and "other" produce the scavengers would have a good amount of time to learn some new skills such as market style gardening.
Also one person or small group wouldn't consider killing a beast the size of a cow/bull for food if they had no way of preserving it, most likely they would dispatch a pig which can be processed more easily.
So hypothetically there would not be a mad dash to starvation because lack of food.
Something else that may be of interest is the future of farming on video.
http://video.google.nl/videoplay?do...=Natural+World+-+A+Farm+for+the+Future&hl=nl#
There would be little food to scavenge, certainly not in supermarkets which empty fast enough anyway, introduce a pandemic or something and the shelves would be cleaned in a day.
As for killing a pig, you have to find one first.
Do you know where to find good seeds? Little things like that are important.
You'd die in the end, if not from starvation then from some idiot who really wanted your stash of tinned food.