This is probably a bit of a long shot but I found this death record online, registration place Adelaide, Australia. The transcription gives an age of 95 therefore approx dob 1819, father (should this be husband) William Maddocks.
I have been unable to find the death of Rachel Maddocks b. 1821 in England. She was married to William Maddocks who died in Luton, England in 1876. I have not been able to trace Rachel in England after the 1881 census in Luton, however, her daughter Margaret married Robert Morris in Sydney Australia in 1890. This made me wonder if Rachel had also gone to Australia and whether this could be her death record.
I would be very grateful for any help proving this theory, or otherwise of course.
Pinetree