It's no Choc Honey Comb SupaShake, but it's alright.

I saw this on the shelf in my local IGA between the UHT milk and coffee additives.

The fact that is was here and not in a fridge means it's shelf stable and therefore likely a UHT milk base. Not really a problem, especially as it's flavoured. Just make sure to chill it, drinking room temperature milk isn't a great experience even if it's safe to do so.

It tastes alright, but upon opening it, there's quite at hit of a chocolatey smell and something else. The honeycomb mostly comes in the flavour and maybe a little in the unidentified 'other' smell.

Ingredients wise it's all fairly boring:

Milk (79%), Water, Sugar, Cocoa powder (0.7%), Flavours, Acidly Regulator (339), Vegetable Gums (450,407,466). Salt, Emulsifier (471).

To demystify the numbers:

Acidity Regulator (339) - also known as sodium phosphate. From what I can gather it's either in there as what is says to regulate acidity, or possibly as an emulsifier (to make things stay mixed).
Vegetable Gums (450,407,466). 450 I think is in it to change / alter the texture, it's also used as an acidity regulator it's also known as Potassium and Sodium Diphosphate. 407 is Carrageenan it's a seaweed and is a thickener / gelling agent. 466 is cellulose gum and is another thickener, stabiliser, emulsifier or binder.
Emulsifier (471) - is produced from vegetable oil.

I feel like it could've used a little more milk as the mouth feel is a little bit watery.

It's not very Violet Crumble in its flavour, yes it's a chocolate honeycomb flavoured milk, but it's not a Violet Crumble-flavoured milk.

I'm not sure I'd buy it again. Because there's the need to refrigerate it before consumption, it's less of an impulse purchase and more of a thing to buy for when I'd fancy it. Also it's just milk rather than the aforementioned SupaShake which threw in the textural qualities as well.