Running out of idea's Barbara.... trying the National Archives...
Official Number: K50122
Place of Birth: Manchester, Lancashire
Date 05 March 1900
Catalogue reference ADM 188/966
Dept Records of the Admiralty, Naval Forces, Royal Marines, Coastguard, and related bodies
Series Admiralty: Royal Navy Registers of Seamen's Services
Piece 50001-51000
.............................................
Medal card of Wallwork, William
Corps: Lancashire Fusiliers
Regiment No: 18800
Rank: Private...
There are 12 other Medal card ref's...

Let's hope this gives a clue....