Watson,
It is easy to confuse Darley in Peak District about 25 miles from Derby with Darley Abbey, one mile North of Derby.
This is the National Archives description of the Chancery bill and neither Darley or Darley Abbey is mentioned and other National Archives summaries of different cases sometimes specify "Darley near Derby".
NATIONAL ARCHIVES DESCRIPTION of BILL:
Reference: STAC 4/9/47
Description:
PLAINTIFF: William Barnbridge, William More, and Humphrey Buxton DEFENDANT: Robert Smyth, Roger Burden, William Bukley, John Hepe, Roger Myddelton, and Robert Wilson PLACE OR SUBJECT: Destruction of a bridge and assault on men working plaintiffs' millsat Derby COUNTY: Derby
Date: 19/07/1553-17/11/1558
Held by: The National Archives, Kew
Unless I get a copy of the bill I won't know where the mills or the bridge destroyed were.
Andy_T