St. Michael's Church, Musbury

This Medieval church is probably most famous for its connection to the Drake family, including a highly unusual memorial to them in the church. St. Michael's was extensively restored in the 19th century, including the remodeling of the chancel in 1865 and the rebuilding of the North Aisle by Pearson Hayward in 1875.

The Venetian mosaic reredos by Salviati was a gift to the church by Sir William Drake of Oatlands in 1874.
 

The Drake Memorial

Sources:
Barr, Sheldon. Venetian Glass Mosaics: 1860-1917. London: Antique Collectors' Club, 2008. 125. 
Notes on the church of St. Michaels, Musbury, the Drakes of Ashe and their monument. 9.
Cornish Churches 
Past Remains 

St. Andrew's Church, Earl's Colne

Parts of this church date to the 14th century, but H.W. Hayward restored it 1863-65.

A Salviati mosaic reredos of The Last Supper from around 1875 decorates the altar, which were designed by J.H. Hakewill.

Sources:
Barr, Sheldon. Venetian Glass Mosaics: 1860-1917. London: Antique Collectors' Club, 2008. 125.
Bettley, James. The Buildings of England: Essex. New Haven: Yale University Press, 2007. 331.
British History Online
Church Plans Online
keithb on Panoramio
Simon K's flickr Photostream

St. Andrew's Church, Exwick

Built 1841-42 by architect John Hayward, this church was later enlarged in 1873-75 by Hayward at the expense of William Gibbs of Tyntesfield.

However, the church's planned tower was never built.

The original 1841 reredos by Simon Rowe was embellished in 1875 with Salviati mosaics of the Ascension of Christ flanked by two apostles on each side. Incidentally, the chapel at Gibbs' estate built at the same time was also decorated with Salviati mosaics and he may have suggested their use in Exwick.

Archival photo from 1936

Sources:
Wikipedia
Cherry, Bridget and Nikolaus Pevsner. Buildings of England: Devon. 5th ed. New Haven: Yale University Press, 1991. 387-390.
David Cornforth for Exeter Memories
Peter Holmes on Geograph
Current photographs of the reredos were kindly provided by Graeme Salisbury of St. Andrew's, Exwick