Page 5 as I recall. You did seem to think it was quite important.
The exact responsiveness of any kind of alcohol to a particular change in price will vary from place to place, but in almost every instance that has been studied or for which data are available, price increases have led to decreases in consumption, and decreases in price have led to increases in consumption. In general, across different places and in different times, it has been found that spirits are most responsive to price changes while wine and beer are slightly less so (e.g. Edwards et al, 1994).
And I agree with Ben Goldacre, it's annoying when you can't get hold of the original paper but I'm not going to pony up for a university library card.
Petrol is different. I'm fairly sure people can do what they need to do during the day without alcohol. The memsahib informs me that she can't get the kids to and from school then get to her work without using a car and since there are four kids it has to be on the large side. Unless she jacks in her job and hauls the weans around by bike she will need to keep buying petrol.
In the summer we borrowed my dad's diesel S80 which gets 2-3 times the mileage per dollar that our 940 2.4 petrol wagon gets. We went more places because it didn't cost more. When my dad got the all clear and was allowed to drive again we stopped running around so much. Of course I do the sums on whether it's cheaper to use the car or the train and few people bother with that. Even I don't consider tyre wear etc just fuel and parking. I also do the sums and conclude that it's probably not worth rushing out to buy a diesel and we will keep the petrol one for a while longer.
You might not know for sure what pricing will do but you do know that education doesn't seem to have worked. Longer opening hours doesn't seem to have made us go all continental either. The last Westminster gov tried that one.
I suspect there is more to it than the secondary sale. Tesco are claiming that they will sell alcohol from England and ship up vans from Daventry. Now, I know Pringles are spendy, but it's hard to see them having enough margin to cover a van from England. They may be willing to sacrifice profit for market share and presence. I would be less susceptible to a secondary purchase on line as I have time to sit down and do the sums which might not happen in the heat of the moment in the checkout queue.
Tesco might not be the best example as they have come out in favour of minimum pricing.