The marble and Caen stone reredos was adorned with Salviati mosaics.
The chancel in 1909
The most recent restoration took place in 2002-03 and included the redecoration of the whole interior, which brought it more in line with the original Victorian design.
Although the mosaics reredos appear to be different than in the archival illustrations, it's unclear what changes were made and why.
Cherry, Bridget and Nikolaus Pevsner. Buildings of England: London 3: North West New Haven: Yale University Press, 1991. 166.
St. Mary's Ealing
Ealing Civic Society
Mark Hillary's flickr Photostream
John Salmon on Geolocation
Jackson, Edith. Annals of Ealing: From the Twelfth Century to the Present Time. London: Phillimore & Company, 1898. 240.