That RF/London Regiment is always confusing!
If we take the Territorial statement, the 1st Bn, London Regiment was part of 167th Brigade, in 56th Division from February 1916 to the end of the war.
In 1918 56th Division were not engaged in any 'Battle or Engagement' until the 'First Battles of the Somme 1918' starting on 21st March. That is not to say that they were out of the action, and it would take more digging to find exactly where they were. However, if Pte Rattle died of wounds, they could have been inflicted at any time previously.
The 56th Division was involved in 'The Cambrai Operations', 20th November - 7th December 1917, including Battle of Cambrai, The Tank Attack, Capture of Bourlon Wood, The German Counter-attacks.
You might have to get hold of a War Diary to find out more, but Other Ranks' names are seldom included.
My source for this: British Regiments 1914-18 and A Record of the Battles & Engagments of the British Armies in France & Flanders, both by E A James.
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