It is the 1930 Electoral Roll and what I didn't notice before is that Charles Shepherd is also with Ada and Ellen Cooke.
Yippee!
That ties in nicely with death registrations:
CORKE Charles age 85, Sep qtr 1934 Yarmouth vol 4b p1
CORKE Eleanor, age 81, Mar qtr 1931 Yarmouth vol 4b p14
Given that Ada CORKE (born c1884) is on the 1911 census I looked for marriages in Norfolk after 1911 - nothing.
I looked for deaths 1911-1983 Only one:
CORKE Ada M age 78, Dec qtr 1968 Yarmouth vol 4b p614
but this ties in with a marriage:
Sep qtr 1913 Yarmouth vol 4b p12 - WESTGATE Ada M to CORK Bertie
so it can be eliminated
The case for Ada CORKE being the same person as Ada Hannah SHEPHERD is getting stronger.
I am now checking off every England/Wales marriage for Ada to Mr SHEPHERD (there are none in Norfolk)
Philip