I am a little curious about this all round.
(First off, it is a really good idea to start out with what you really *know*, in this case that your grx2 grandparents were William Warley and Ethel Small who married in 1941 -- if that is what is known for certain, to the certain knowledge of living people or from a chain of certificates.)
You are looking for the identity of your grx3 grandparents, the parents of your grx2 grandparent William Henry Warley 1913.
William married in 1941 and had children in the 1940s.
So someone born in the 1940s was your great-grandparent ... your great-grandparent is barely older than me!
At a stretch:
The eldest of their children (I believe this is the correct child, from a surname in a later generation) could have had a child around 1960 who would be your grandparent.
That child could have had a child in the late 1970s who is your parent.
That would make you born in 1995ish at the earliest, really! Unless there was a succession of really
very young parents in your recent ancestry.
It's about 70 years since the birth of the eldest child of your grx2 grandparents William and Ethel, who would be your great-grandparent. We need to squeeze in three more generations of people who are now adults, in those 70 years: 70 divided by 4 is an average of 17.5 years -- say they were born:
1942 - 1960 - 1978 - 1996
-- or something like that -- which would make you about 17. Were all of your recent ancestors child brides or grooms?

I can't resist -- You say you have been trying to track down your grx3 grandparents for some time now ... is that measured in weeks?

Are you quite sure that this couple -- William H Warley and Ethel E Small who married in 1941 -- are your
great-great-grandparents?
I don't mean to pry or be rude, it's just that it really would be uncommon these days for someone to be a great-grandparent before the age of 55: it takes three generations of people having children before the age of 18, on average. And it doesn't seem like that is what happened in your family. It seems like you have added at least one generation between William & Ethel and yourself that did not exist.
Obviously you don't need to give us details and shouldn't, about any living people, but are you very sure that your tree goes:
you
your parent
your grandparent
your great-grandparent
your great-great-grandparents William Warley 1913 and Ethel Small 1916
? This probably doesn't affect your tree back from there, as the descent from the 1941 marriage makes sense except for the number of generations. But it's a good idea to be very sure of who you are tracing.
So ... if William and Ethel are your forebears one way or another ... and William is the one born 1913 to Margaret M James and Alfred H Warley:
Margaret M Warley born c1895 died 1931 in Plympton
Alfred Henry Warley born 1891 died 1974 in Plymouth
So ... one would think that the living child and grandchild of William & Ethel would have known Alfred before his death in 1974, if he was William's father?
In 1901, Alfred Warley was in Plymouth with parents William H and Bessie.
I think Margaret James must have been from Wales, but far too many Margaret M James-s were born 1895-6 to guess.
Do come back with the certificate info when you have it, and good luck!!