The best way would be to get a birth cert for one of the children, as that will show mothers previous names.
Their births are in the index on FreeBMD as folows:
Annie Beatrice
Oct/NovDec 1885
Mutford ref 4a 895
Frederick Henry
Jan/Feb/Mar 1887
Mitford (sic)
ref 4b 920
Walter William
Oct/Nov/Dec 1888
Mutford 4a 895
Henry Alfred
Oct/Nov/Dec 1890
Mutford 4a 832
With his middle initial as A, and the first child being bn in Middx, this marriage looks possible:
Oct/Nov/Dec 1883
Alfred Andrew Creasy
one of brides on same page - Emma Wilks
Islington ref 1b 491
GRO indexes shows
mmn WILKS for all above birth entries
Here's the transcript of the marriage the original not available to view on Anc*y
3 Nov 1884 St James the Apostle, Islington,
Alfred Andrew Creasy age 24
father FrederickEmma Wilks age 22
father EdmundEmma Wilks Baptism 1 Dec 1861
Great Barrington, Gloucestershireparents
Edmund occ Labourer &
MaryGRO indexes
WILKS, EMMA
mmn FARMER 1861 D Quarter in STOW ON THE WOLD Volume 06A Page 332
Great Barrington is in the registration district of Stow on Wold
This looks to be
Emma Wilks on 1881c age 20 born
Barrington Gloucestershire
https://www.familysearch.org/ark:/61903/1:1:QK65-1937edit and Emma on 1871 census with her family
RG10; Piece: 2653; Folio: 31; Page: 4
Edmund Wilkes 46 occ Ag Labourer
Mary 45
John 20 occ Groom
Edwin 16
George 12
EMMA 6 Maria 7
all born Gt. Barrington Gloucestershire
1861c RG 9; Piece: 1789; Folio: 31; Page: 5
17 Principal St., Gt Barrington
Edmund 36, Mary 35, John 10, Henry 9, Edward 6 George 2
1851c HO107; Piece: 1970; Folio: 36; Page: 23
Edmund WILK 26, Mary 25, John 10 wks, William Pitts 78 lodger
Edmund Wilkes Baptism 10 Oct 1824 Great Barrington, Gloucestershire
Parish as it Appears: Great Barrington
Father Thomas occ Labourer
mother JoyceEdmund Wilks age 70
Burial 6 Dec 1894 Great Barrington, Gloucestershire