Oh wow... thank you for all your interest and help; I'm so grateful.
I have gleaned the following information from service papers I've found on 'ancestry.co.uk and apologise if I've interpreted it incorrectly!
His name was William Preston (middle name Frederick but this did not appear on his service records with the Royal Fusiliers or the Chinese Labour Corps) born circa 1873.
According to his Royal Fusilier papers he was born in Birmingham and I know his father was Isaac Preston.
Please don't confuse him with another William Preston who was also serving in the Grenadier Guards at the same time. That one was William (possible middle name Charles) Preston born 1873 in Derby, father John Preston.
I have been unable to locate any details of 'my' William's service with the Grenadier Guards, although his marriage certificate (1894) and various papers associated to his WWI service indicate he served with the 1st and 3rd Battalions. He was discharged from the Grenadier Guards
on 1 Oct 1904.
23 Aug 1914 - Attested with the Royal Fusiliers. Different documents state he was with
12th Company, or 12/2 Company. Service No: 4025.
Other paperwork refers to William being a Corporal with Service No: 594.
10 Sept 1914 - Formally discharged from the Grenadier Guards ‘Irregularly enlisted’.
Formally transferred to the 7th Battalion, Royal Fusiliers. Rank: Acting Corporal. Also served with the 7th and 16th Battalions. (confusing considering the information above!)
1 Sept 1916 -Transferred/posted to the 22nd Training Reserve Battalion as now unfit for overseas service.
25 July 1919 - William re-enlisted in the Chinese Labour Corps in the rank of Acting Sergeant. Service No 714272.
5 March 1920 - William was discharged from the Chinese Labour Corps.
Any help, no matter how small, will be much appreciated, regarding the medals and particularly regarding his pre-WWI service with the Grenadier Guards. Thank you!