Where to buy a wine package onboard

Thanks to the folk who commented on my previous post about the advantages (or not!) or buying a wine package in advance. I've decided I'm going to buy a package while on board and use my onboard credit (which I've already got) to pay for the package. That way, there's no worrying about exchange rates etc.

Can anyone tell me how I go about purchasing the package onboard? Do I just speak to the waiter or do I have to go to the purser's office or somewhere else?

Thanks.

I always buy it directly from my sommelier on the first evening. Although the 15% gratuity doesn't get added on, it is included in the price you pay and is clearly shown on the bill that you sign - at least it was when I bought one in June. So that keeps the sommelier happy too.

If you managed to be onboard in time for Lunch ( Lido/Kings Court) You can order from 'any of the Sommeliers' who are patrolling the Buffet area. ( if you have your table number handy, otherwise you just hand them your key card) Choose your preferred selection for your evening meal. Your wine will be either chilled ( or not) on your arrival at your table

This is usually one of the first things I do ( including ordering a glass of wine or two with Lunch) Pe ordering before you arrive at your table saves a bit of hassle of signing and waiting. ;)