Seeking the date Sarah died Sarah was born circa 1829, her maiden name was Wright, maybe in the Luton area She married James in 1851, St Marys Luton She was living at 154 Chapel St, Luton according to the 1881 census
If you check FreeBMD at http://freebmd.org.uk/cgi/search.pl you'll see a death of a Sarah Walker aged 52 in Luton in the Sept quarter 1852. If you order the certificate from the GRO you'll find out if it's your Sarah and the date she died.
David
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Census information is Crown Copyright, from www.nationalarchives.gov.uk Beds: Cople: Luke/Spencer Everton: Hale Henlow: Cooper/Watts/Sabey Potton: Merrill Southill: Faulkner/Litchfield/Sabey Woburn/Husborne Crawley: Surkitt Hunts: Gt Gransden: Merrill/Chandler/Medlock Toseland: Surkitt/Hedge/Corn Cambs: Bourn: Bowd Eltisley: Medlock Graveley: Ford/Revell