Thank you Bill, of course I'll let you know - I'm determined to find him 
hiya kat.there were 50 t fishers killed in ww1,i have eliminated 31 of these for various reasons,most are too young to be your gg grandfather,these are whats left
ALL T.FISHERS
21616 MGC arras mem
16904 cheshire regt
17931 welsh regt
17530 royal inniskilling thiepval mem
241908 liverpool regt thiepval mem
26232 duke of wellingtons
513852 london scottish
63559 south lancs
28817 worc regt
20935 RGA
471442 london regt thiepval mem
1786 black watch thiepval mem
332630 liverpool regt
R/201361 KRRC
13763 suffolk regt
A/7612 cameronians ploegsteert mem
7423 worc regt helles mem
10851 east yorks regt helles mem
12300 royal irisf fus helles mem
only nine of these men are missing,the rest have a grave,i have added the details of those who are missing,many soldiers remains have been recovered and ID over the years,thomas,s body could have been recovered since your nan last told you about him being missing,so you cant rule out those with a grave,mack