Thanks to Jeanne Horak-Druiff for including the painting in her coverage of the Britannia.
The painting also made a cameo appearance in press photos when Queen Elizabeth II visited the ship after presiding over its naming ceremony. Here’s a photo from the @RoyalFamily twitter account showing the painting. It’s that bit of blue between the Queens hat and the captain to her left:
— The Royal Family (@RoyalFamily) March 10, 2015