I'd start a family general store, where there'd be no top-shelf magazines of any description, no cigarettes, and definitely no alcohol.  It would have everyday foodstuffs, soft drinks, newspapers for the adults,comics for the kids, and bars of chocolate for those with a sweet tooth.  Not sitting too high on my moral horse, if you wanted the other things listed you'd go elsewhere.  I'd also like to see a return of the traditional off-licence where you can buy one bottle of beer as opposed to a four-pack as sold in the supermarket, forcing you to spend more, and the family-run butcher and baker, which cater for the individual, as opposed to the masses.  I'd like a bottle of mead, but none of the supermarkets stock it, and half the staff - youngsters mainly, havent even heard of it.