I'm goin to sit on the fence on this one a bit, I can see both sides of the argument here.
I think the removal of all price promotion on alcohol is a bit draconian.
I do feel though that the cynical promotion of below cost alcohol in bulk as a means to drive footfall into your supermarket/store is wrong. Bulk discounts on macro brands and the below cost selling of spirits has been the main focus of promotional activity of the big supermarkets since the removal of the groceries order. Alcohol is now cheaper then it was 20 years ago whereas groceries are not.
It is unsustainable, and from a 'supporting craft beer' perspective it makes craft beer more difficult to sell as people perceive the cost of production to be much lower then it actually is. It makes it very difficult for craft beer producers to compete, and ultimately will lead to less choice as to where alcohol is purchased and what products are offered for sale as the supermarkets squeeze out the independent trade.
I know, that for instance during the month of December the off licence departments in some of the supermarkets were running on a margin of -12 to -13%, nobody can compete with that.
Whilst in general I do not support laws that control markets, I do feel that at least the below cost selling of alcohol as the intoxicating carrot to drive people into your store and the arguable subsidisation of this practice by the VAT system is wrong.