Hi -we are not allowed to do 1911 look ups - copyright issues -among other things
You can search the index free
However the 1911 census was taken on 2 April 1911 -and if this is William's death reg
William John W Parker
born 8 April 1911
death reg July 1991
age 80
Pontypridd
27 1052
you will notice from his d.o.b. he was not born when the census was taken
purchase of the birth cert may be the way to research further
Suz