i am going to suggest the following link>
http://www.kent-opc.org/Have you checked that he is not interred with his wife in Kent?
the only certificate reference for this death I am seeing is >William T Phillpott
Birth abt 1878
Registered September 1951 Age 73 at Portsmouth,Hampshire 6b 335
[can someone else check I have correct cert please?]and suggest you order that death certificate as it will have more information and probably place of death.... then you will need to probably contact County Council or the council in the region closest to his address......