I've just watched this on Netflix and I have to say the score is one of the best I have heard in a long time. A great main theme plus incidental music in the style I love, grabbing your emotions and sweeping the story along. The 12-part series is a work of (mostly) fiction set around the construction of the Titanic in Belfast and not about the sinking.
The score is actually solely credited to one half of "G & M De Angelis", ie., Maurizio de Angelis and the three executive Producers are three more De Angelis's including Guido.
Yes, it seems that there is no CD but is available at Amazon to download. There are samples to listen to but it's only by watching the series that you will really see how good this is.