Might be better off finding a reddit dedicated to handwriting, I can make out Pool- Something. Looks like maybe a C with some L's or I's? Could be an honorary, like a Post Colonel who maintained history/ceremony? I'm unfamiliar with specifics within some units.

The rest shows he was a Private, and was discharged by a Lieutenant Colonel at St. Edmunds on the 14th of July maybe, 1941? The year is a bit hard to read. And the last bit references Suffolk Regiment. Which could either be his regiment or the regiment of the Lt. Colonel who signed everything, since it appears to say LT. C. Suffolk Regiment.