british newspaper archive brings u[p this snippet in the results - possibly his relict??
“... of Mr. Robert Keith Archibald Durham, aged 79 years. ... ”
Saturday 06 May 1865 , Louth and North Lincolnshire Advertiser
fits nicely with this 1861 census entry from Louth
William A Green 48 - proprietor of houses and land, b Louth
Lily Elizabeth Green 48 - b MIddlesex
Lilia Eliza Green 13
Robt R A Green 8 [possibly Robert K A]
Mary Ann Green 53 - sister, anuitant
Sarah Durham 74 - mother in law, landed proprietor and fund holder, b Birmingham
Ann Butters 16 - servant
RG 9, 2382, 17, 4
Her probate registry entry gives Lily Elizabeth Green as one of the executor. estate under £600
Sarah Rotton
Baptism 9 Jun 1786, Birmingham, St Philip
Father Joseph Rotton
Mother Elizabeth Rotton