"In fact, tinned food has an almost indefinite shelf life at moderate temperatures (24°C and below)."
A lot less, I suspect, when it's exposed to the elements in a collapsing shop; rain, debris, fire, summer heat, winter cold are all going to take their toll on the tins and their contents. In addition, while the food may be edible, I believe one of the biggest problems is loss of nutritional value with vitamins and the like. I could see easy access to viable tinned food for a decade or two, but certainly not for generations.
And none of that will help if another group of people have systematically looted the shops in the area where you're living to build up a stockpile of their own; as people have mentioned, petrol will only last a year or so unless you store it properly, and after that you're not going to be driving tens or hundreds of miles to find other sources of supplies.
I do agree, however, with other posters who said that 'Day of the Triffids' handled this more realistically.
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