Rag, I have indeed taken a life long interest in WW1 and have read the histories extensively since my teens.
That does not mean I have committed to memory the names and careers of every General!

This is a Wiki page on "British Army during WW1"
There is a chapter "The Commanders" that lists about 70 generals, but no single mention of Kiggell.
https://en.wikipedia.org/wiki/British_Army_during_World_War_I#Commanders