On
www.FreeBMD.org.uk. By searching with just “Patricia” in 1974
There are 3 Patricia Audrey deaths
One has a date of birth of 25 Feb 1940. The others are 1927 and 1930 dates of birth.
This gives you a surname.
Can use same data base to find a marriage that fits. I haven’t posted because it is likely the husband could be alive.
Purchase of the marriage cert would give you her father’s name.
a possible birth. March qtr 1940 (assuming her parents were not late registering her)
Thorpe Patricia A (mother’s maiden name Smith ) Manchester 8d 172
If they were late there are these two in the June qtr
THORPE Patricia A MMN Keone Essex S.W. 4a 595
THORPE Patricia A MMN Thorpe Tynemouth 10b 446
I think you could order all three at once specifying to the GRO that you only want them if the A stands for Audrey and father X according to what the marriage tells you.