Free index search of 1921 census shows Gladys born 1911, living in Pendlebury.
FreeBMD has a birth in September qtr 1911,Salford Reg. Dist. - Mother's maiden name of Perkin
Probable parent's marriage?
December qtr 1893
Salford Reg. Dist. Vol 8d, page 35
Hully, Francis
Perkin, Alice