dedorah,if the info you have posted is correct,then the cwgc wont change anything,they will only make changes if the man/womans details are wrong,they wont add any further information.
alivicwil2,i cant be sure about your g/gfather,they may change it but i have my doubts,go on the great war forum and give terry denham a shout,terry worked for the cwgc,he still has many contacts there,he will tell you if its worth pursueing,theres nobody else who is more knowledgable than terry,good luck,mack