Thanks both of you, I've had a look around the articles on Wikipedia. I don't have a name because I haven't been able to trace further back than about 1687. I realise this means I don't know if they were living there at the time of the civil war, and I may not ever find out but Long Marston was (and still is) a very small village so anyone with the same surname living there was probably a relative.
Jean, the surname is Holmes. I don't know the first name but William runs in the family (It's practically in every generation). There's also a Robert, Thomas and John in the 18th century.
After doing a bit more searching on familysearch.org there's a marriage of a Thomas and a Matthew in the 1720s, and births in Walton, which is still near to the battle site. All the births have a father Matthew who would've been born in the mid 17th century, after the civil war. So they may have moved from there in the late 17th century.
Andrew