If George Harvey married in Cardiff in 1884, then this must be the marriage?
March qtr 1884,
Cardiff Volume 11a, Page 312
Harvey, George
then either
Hayes, Margaret Elizabeth
or
Parnell, Elizabeth Jane A
I simply cannot find a marriage of George Harvey to Margaret Criddle.
Looks like this George (above) married Elizabeth Jane Parnell, as there is a couple in the 1891 census:
Harvey George age 31
Harvey, Elizabeth J A age 31
Harvey, Lizzie Daughter age 6