Many thanks again for all the responses.
If I can summarise so I can make sure I'm on the right track as I worked on this till late last night to the point where my head started to hurt
The uniform definitely relates to a Fusilier's uniform, most likely to be Royal Scots Fusiliers (I say most likely as from the posts I'm unclear if we can definitely rule out other Fusilier Regiments such as Royal Fusiliers / Royal Munster Fusiliers etc)
The uniform evidences that they were a regular soldier as its dress tunic which wouldn't have been issued post outbreak of WW1. The photo itself is potential around the 1910 to 1912 mark, with the service number indicating an enlisted around May 1914 (though I know service numbers can run out of sync sometimes as they often weren't issued from a central point)
Either way, taking the aforementioned into account, we can definitely say he joined anytime between 1910 and June 1914.
As we believe he was born in 1893 in Southwark, London (though we are struggling to find a birth cert so location may vary - age we are pretty certain of +1 / -1 year due to brothers either side that we have traced who were born Southwark at the family address) he would have turned 18 around 1911
11085 is a possible hit though the soldiers died database lists him as resident / being born in a location with no known family connections and enlisted in Glasgow - so not the final piece to the jigsaw but a lead worth following. No service record for 11085, x1 MIC
There are also two KIAs from the Royal Munster Fusiliers in the same name, hence why I mentioned them earlier 5842 & 5209 No service records available for either, born Ireland, so unlikely but secondary leads to follow unless told otherwise.
Its possible that they married 'finance in photo', hence why medals not passed down to us by parents.
Census for 1911 negative for Thomas Sullivan Royal Scots Fusiliers
What I plan to do know, again unless told otherwise.
Contact Royal Highland Fusiliers Museum and see if they can offer any additional information on the uniform and record keeping.
Send a request off to the Western Front Association for pension info on the above possibles, plus a couple of unlikely's I have to see if I can get any info which links them to family etc
Revisit attempting to trace Thomas' birth cert, including Newport area
Appreciate he may have enlisted, left and re-enlisted or enlisted and changed Corps / Regiments whilst serving but for obvious reasons need to eliminate this line of enquiry before I go broad on the search again.
If I've missed anything or got anything wrong then please let me know
Many thanks again.
Andy S
