Thanks for the reply.
Looks like i will be out of luck on this one, do not think that they sell concentrated blackcurrent in cartons (only small already diluted fizzy version). Shame really as blackcurrent is a popular mixer in the UK. (Every pub will carry it as standard as they will lime juice)
Cruise ships in general are out of touch with current popular drinks i.e. fruit ciders, craft beer, flavored gins and vodka, etc. but hey ho maybe one day?
At least i can pop in to Wetherspoons in most parts of the UK and obtain my drink of choice (Guiness and black) along the way.
Cheers!😇
Jazz