Paul..
Have you tried Old Maps:http://www.old-maps.co.uk/indexmappage2.aspx This site has old maps for various years, in case of Horsley, there are 3 maps, one in 1881. If you put in Horsley Coppice no result comes, but if you put in Horsley, then a map of Horsley shows all manner of places around that village.
In the Derby Mercury, there are two references to Horsley Coppice:
One on the 18th January, 1854, says: At Little Eaton, aged 78, Mr. John Woodward, formerly of Horsley Coppice, much respected.
The second: May 3, 1855, At Bramcote, on the 1st inst.,by the Rev. Aston, Mr. Thos. Wright, of St. Mary's Gate, Derby, to Elizabeth, second daughter of of the late Mr. John Woodward, formerly of Horsley Coppice, Derbyshire.
Tom