Thomas Hardcastle Sykes, married to Mary Platt, daughter of John Platt, an English manufacturer of textile machinery and Liberal politician, was a captain in the 20th Cheshire Royal Volunteers.
Sykes married Mary Platt, daughter of John Platt, of Platt Brothers textile manufacturer and MP for Oldham. John Platt (16 September 1817  18 May 1872) ) was an English manufacturer of textile machinery and Liberal politician. He was also a captain in the 20th Cheshire Royal Volunteers. 
