Rosa

It seems, in my humble opinion, to be going back to its roots. I've watched Doctor Who since "An Unearthly Child" and back then it was partly intended to be educational and so was a mix of drama, science and history. This blended actual events with the storyline and reminded me of those early episodes with William Hartnell's Doctor explaining things to Ian & Barbara. As this was set in the time I was born, it's an era I have a bit of an interest in and as I'm also a bus driver those parts of the story were naturally of interest. I thought they blended the history and the fictional components quite well. There were, for me, a few loose ends but this early in the series I'd expect that.