There are some mentions in The Times of this case:
The Times, Saturday, Mar 25, 1899; pg. 4; Issue 35786; col E
Frederick was seeking a divorce from Elizabeth on the grounds of her adultery with Walter Richardson and damages from Walter Richardson.
Frederick and Elizabeth. married Sep 30 1893, at St. George's Church, Westcombe-park, Greenwich. In June, 1898, he heard "certain rumours pertaining to his wife's conduct", returned home early and heard her talking about said misconduct with a friend of hers, Mrs Parnacott.
She then went to Seaford with Mrs Parnacott and onto Brighton where she supposedly stayed in a hotel with Walter Richardson.
Mrs Parnacott was a widow, Mrs Ada Parnacott, who had a child and worked as their housekeeper; supposedly Walter Richardson had offered to help get her son into a certain school if she remained quiet about what she knew about the affair.
Other witnesses included Richard Cosker, Frederick's brother, and Mrs Mary Cosker, Frederick's sister in law.
The Times, Wednesday, Mar 29, 1899; pg. 13; Issue 35789; col D
- the case continued. witnesses included Mrs Martha Kept, Frederick's sister, Mrs Margaret Rance, a music teacher (who had taught Elizabeth)
The Times, Wednesday, Apr 19, 1899; pg. 3; Issue 35807; col D
The Times, Thursday, Apr 20, 1899; pg. 3; Issue 35808; col D
- more continuations, nothing about Elizabeth's family, though.