http://www.channel4.com/history/microsites/H/history/war/

Update: Original no longer accessible so here’s an alternative full of material about The Wars of the Three Kingdoms 1642 – 1658, particularly the English Civil War.

https://www.english-heritage.org.uk/learn/histories/the-english-civil-wars-history-and-stories/

English Heritage give plenty of links to primary source material