@Gardenlover I was about to post about this show but found your post. A friend of mine recommended it to me awhile back so I started it about a week ago and am already up to the end of the third season. I guess I am enjoying it too..lol.
I have watched all that is currently available. My interest was piqued because of a family connection to Dorset in the time of Alfred the Great but I knew sod all about those times. The first series highlighted the interplay between the Saxons and the Danes and the rivalries of the different Christian kingdoms of those times. It stimulated me to learn more by researching using my very old set of Encyclopedia Britannica (still useful for medieval history).
Since then I have been watching for purely fictional entertainment.