[Merry]

The May 1892 marriage entry for William James Brown and Ellen Woodcock in Skelmersdale gives their ages as 23 and 19 respectively. He has signed Walter James Brown.

On the 1901 census William is Walter again, but confirming it's them Ellen's father, George Woodcock (same as recorded at the 1892 marriage) is also in the household.

Childen listed are:

Florence 8
Alfred 6
Walter J 4
Jessie 2

all born Skelmersdale

In 1911 additional children are

Cicely 10
Nellie 8
Arthur 6
Harry 2
Minnie 8 months

Ellen says she has delivered 9 children and 8 are still living.

I don't know how you managed to only find one birth on LancsBMD as they are all there! I didn't look at the GRO site because it's so much quicker to use LancsBMD:

BROWN Florence WOODCOCK 1892 Lathom Preston LAT/30/72
BROWN Alfred WOODCOCK 1895 Lathom Preston LAT/32/89
BROWN Walter James WOODCOCK 1897 Lathom Preston LAT/34/20
BROWN Jessie WOODCOCK 1899 Lathom Preston LAT/35/86
BROWN Cicely WOODCOCK 1901 Lathom Preston LAT/37/28
BROWN Nellie WOODCOCK 1903 Lathom Preston LAT/38/63
BROWN Arthur WOODCOCK 1905 Lathom Preston LAT/39/99
BROWN Harry WOODCOCK 1908 Lathom Preston LAT/42/57
BROWN Minnie WOODCOCK 1910 Lathom Preston LAT/44/36

The last seven children are on the 1911 census, so it's either Florence or Alfred who had probably died.

This is the only match I could see (FreeBMD):

Deaths Sep 1904 (>99%)
BROWN Alfred 9 Ormskirk 8b 706

I did have a look to see if William was Walter at birth. This is his registration:

Births Mar 1869 (>99%)
Brown Walter James Shrewsbury 6a 710