Susan, You may already have this.
Is this the family, in 1911 in Toxteth, Liverpool?
Address at “18 in 2 Court Mill St Toxteth Park Liverpool”
Henderson, James; Head; male; age 49; occupation Moulder (Iron Foundry); born Liverpool, Lancs
Henderson, Sarah; Wife; married 18yrs; female; age 47; [no occupation]; born Liverpool, Lancs
Henderson, James; Son; male; age 13; [occupation blank]; born Liverpool, Lancs
Henderson, Francis; Son; male; age 3; [occupation blank]; born Liverpool, Lancs
RG14; Piece: 22217
Registration District: Toxteth Park; Sub District: Toxteth Park North West; Enumeration District: 6
Parish: Toxteth Park; County: Lancashire
Henderson James; Mar Qtr 1898; District Toxteth Park; Vol 8b, page 158
At 13 in 1911 (b 1898) he would have only become 18 in 1916.
Assuming he became a soldier legally (and not enlisted under a false name underage) then even if he volunteered before the end of 1915, his enlistment would have been deferred until the start of Conscription in 1916 and as such would NOT have had a choice regiment or corps, but would have been sent to the regiment where there was most need. As his father was a “moulder in an iron foundry”, it’s possible he got his son work at the same place, if that was the case James’s call-up could have been deferred longer as a “reserved occupation”. The main point is he may not have served in the Liverpool Regiment or one of the other Lancashire regiments.
Since my response to your original query in Aug 2011, there are many more records online including the Liverpool Roll of Honour at the Town Hall.
Firstly on Ancestry are ALL surviving WWI soldiers documents, (Burnt documents) and those rebuilt from WWI pension applications from sick & disabled soldiers, they also have colour scans of the actual WWI Medal (roll) Index Cards (MICs) that give details of man’s medal entitlement with the index reference to where his name appears in the actual medal rolls held at Kew (not online). B&W versions of MICs are available via the National Archives, web site.
A database version of Soldiers [who] Died [in the] Great War publications is also available on Ancestry and the Findmypast web site; the latter has a simple search facility that I find easier to indentify casualties; WWI casualties are also commemorated on the Commonwealth War Graves Commission’s web site at http://www.cwgc.org/
and sometimes there is next of kin details listed.
The Liverpool Roll of Honour can be found at http://www.civichalls.liverpool.gov.uk/townhall/rooms/hallof...
As you say he served & died during the war, you need to cross reference the various lists that contain those that died until hopefully you find your James Henderson.
For example, there’s a J Henderson on the Liverpool Memorial who served in the 2/6th Battalion Manchester Regiment, but he didn’t appear in the Born Liverpool list of 26 from SDGW, so replacing James with initial J and adding the regiment and it transpires his name was John Henderson.
He has the 6-digit number 203657 that indicates he was Territorial Force soldier and the catalogued National Archives entry for his MIC shows the number is the only one on his MIC indicating he didn’t serve in a Theatre of War until after the whole of the Territorial Force was renumbered early in 1917.
Unfortunately there are no next of kin named on the CWGC’s site.