His service records do exist. There is very little information on them regarding where he was between going out to Egypt in 1915, suffering with malaria nd dysentary all through 1916, becoming a skilled Carpenter and joiner, and coming back to UK in 1918.
He appears to have spent all those years in the middle east. The "theatre of war" is Egypt but this could mean anywhere around there - Egypt, Palestine, Gallipoli, Salonika, Greece, Albania etc etc. He came back to the UK via Salonika in 1918.
This is info from the service papers:
ATTESTATION PAPERS
Territorial Force: signed for duration of war UK and abroad
Enlisted 8th November 1914 in St Helens age 19
Enlisted in W.L.D.R.E. (This is Royal Engineers but I am not sure what the WLD is at the moment. At a guess I would say possibly West Lancashire Division Royal Engineers - as this fits well with enlistment in St Helens)
Occ: Coach Builder
Address 240 Fylde Road, Preston
5ft 6 inches. Good physical development
Trade in Royal Engineers: Carpenter (Certificate of Trade Proficiency - very good carpenter and wood worker)
Home 15/11/1914 - 27/6/15 (ie in UK, training etc)
I think it says "posted E Force" or "med E Force" 28/6/1915 (ie refers to him being sent out to Egypt with Egypt Expeditionary Force or Mediterranean Expeditionary Force - as shown on his medal card)
There is also a page which lists quite a few things - such as his raising to skilled rate of EP as a joiner.
And various times in hospital with malaria and dysentary throughout 1916.
There are numbers of the hospitals but no specific places mentioned.
With some hard research work you may be able to identify them from their numbers if you can decipher them
In Feb 1918 he left Salonika on route to UK.
Had suffered Malaria and so was posted within UK.
Got posted to L. E. E Gillingham 20/5/1918
Demobbed 7/3/1919
NEXT OF KIN
Wife - Alice Brown, 27 Norris St, Preston
Son - Robert 24/12/1914
MEDICAL PAPERS
Discharged: 7/3/1919
Given address: 27 Norris St, Preston
Married
Disablility code 23 (Malaria)
Degree of Disablement less than 20% (NB they graded the disability to see how much money they should give them and how long for)
Dispersal Unit papers dated 8/2/1919 say:
Record Office RE Charlton
Granted 28 day Furlough
Born 1895-
Unit London NEE
Regt. RE Electrical
Pension Weekly rate 5s 6d to start 8/3/1919 - and be reviewed in 39 weeks
There is a thread on a St Helens Forum not Rootschat

which you may find interesting
http://www.sthelens-connect.net/forums/topic/43525-55th-west-lancashire-division/Milly