Sounds like some 60's groups

I admit my knowledge of the British Civil Wars comes from the movie Cromwell, (Charles 1 looks like Alec Guiness & Cromwell looks like Richard Harris) but I saw it ages ago, and can remember very little about it.

Short biographies of those that Jane mentions can be found here.
http://www.british-civil-wars.co.uk/biog/index.htm

The Earl of Strafford was Thomas Wentworth, of Wentworth Woodhouse, related to the Fitzwilliam family as Linden related previously.