Welcome back Mark, hope you had a good holiday.
The new economy service is not all as described. The "welcome cocktail" is a little misleading as it isn't served until a good hour into the flight, rather than served once seated (like they have in premium economy and upper class).
Funny you should mention the above because I was talking about this on another forum recently. Well the original question was about not being able to get/buy a bottle of water if you're sat in your seat and the plane is delayed and still on the tarmac......so, I did a bit of delving.
From what I was able to gather and it took some searching, the metal containers which hold all the drinks (and the other items they sell onboard) they are sealed both before take-off and before landing, and this is to avoid the airline paying the VAT/import/export tax to the country of departure and arrival, on those items which are subject to tax collection.
So, going back to the water question, the reason why they won't break the seal for a bottle of water costing £1.50, is because the airline would be liable to pay the tax on the entire container, which depending how it has been stocked /loaded may contain spirits, jewellery & perfumes, and anything else they flog, (all subject to various tax levels), and whilst it may not sound a lot, if you mulitply that with the amount of flights and the number of containers opened, it will amount to a considerable amount for the airlines to pay out within a financial year.
Then we come to my experience of being offered either orange juice or champagne in upper class (a bottle of water was already next to my seat) on boarding at Heathrow/HK/ Sydney/HK.
Well I suspect it comes down to the loading factor and how the containers have been stocked. Orange juice/water will not be subject to the tax levels of spirits and champagne, and where champagne is offered, the tax on champagne has already been pre-paid by the airline ( possibly via some generous deal) and is incorporated into the price charged for the seat.
Finally (I know I go on a bit)
the reason why the drinks trolley does not appear until about an hour into the flight, is because they cannot open the containers and break the seal until the aircraft is in International airspace, just in case the plane has to return to the point of departure for whatever reason, and thus liable to pay the tax on the entire stock.
So, yep, you will be offered champagne in upper class as soon as you step onto the aircraft, but you have paid (dearly) for the privilege.
Sanji