Here are three videos showing the rise and fall of states in the British Isles during the Middle Ages, along with a fourth bonus video.
The first video, created by Ollie Bye, shows the entire British Isles from the year 43 CE to 2016.
EmperorTigerstar has this more detailed look at Anglo-Saxon England, between the years 600 and 954
MapNation provides this map of Scotland from the years 841 to 2016
Finally, check out The Difference between the United Kingdom, Great Britain and England Explained, from CP Grey