Sorry if this is an obviois question - but was Haydon definitely Elieens's maiden name, and not her married name?
The only birth reg for an Eileen W, in Jul/Aug/Sep 1921 is for an :
Eileen W Pinches, Jul/Aug/Sep1921, Walsall ref 6b 1441
Then there is a marriage:
Jul/Aug/Sep 1941 Walsall ref 6b 1947
Eileen M Pinches / Edward J Haydon
There is a marriage oct/Nov/Dec 1909, Walsall ref 6b 1312 for James Henry Pinches, one of possible brides is Gertrude Prior