I had it last year and it was ok from memory. It is a relatively low abv for what I drink in winter so I have to reset my expectations. Think I'll be happy to revisit 750ml again.
Got a feeling I have had the choc vanilla stout but might be confusing it for something else.
To be honest I wasn't that fussed about the Plum Grand Reserve. It was a bit meh.
Nice swing bottle though.
Titanic's best beer is the Chocolate and Vanilla Stout but it's fucking well hard to find.