As a person who occassionally sips a glass of wine you may find the following of use.
In Carrifour (sorry spelling) supermarket complex there is a wine/beer shop that is now owned by Majestic Wines. They are on the majestic Website France showing the French price and comparing it to the UK discount price.
If you turn up and buy (I think £90) they will provide a Taxi to the top of the visitors Pontoon (you cart it down the pontoon yourself)
If you pre-order - you still only pay when you collect BUT you will be entitled to a further discount of IIRC £30 for £300 spent and £90 for £800 spent. So combine you and your crews orders, pre -order on the internet and collect in Cherbourg.
Next tip - if you pay by credit card you are charged in Euros but if you pay by UK cheque or or cash they charge in £ but with a favourable exchange rate (currently 1.20 Euro =£1).
Say Roger sent you and ask for a Taxi at the end and if you buy enough they will throw in , wine discount, further cash discount, favourable exchange rate and the Taxi!!
They are cautious about people sampling the wines as it has been know for some UK people to get a bit drunk and leave saying they will be back but if you pack a trolley (1 Euro deposit) first with what you are certain to buy they recognise you are a serious buyer and will helpfully open the odd additional bottles so that you can decide whether to buy more.
Hope this helps.
On one rough return trip my friends daughter fell out of the top bunk but luckily she did not hurt herself as the wine boxes were stacked up to within a few inches of the top bunk!