You're probably aware, scans of and transcripts of the battalions War Diaries are here:
http://www.queensroyalsurreys.org.uk...t_Surrey.shtml
http://qrrarchive.websds.net/menu2.aspx?reg=ESR
I have a bit of an interest in the battalion as my grandfather was in "B" Coy of the 12th East Surreys.