An addendum.
A bit more delving has unearthed the following bits and pieces:
Brook refers to Brook War Hospital, Shooters Hill and the following link may assist you:
https://wartimememoriesproject.com/g....php?pid=13564
Your chap has 3 locations shown as his place of birth, all in the same vicinity in Suffolk; Sudbury, Cosford and Whatfield.
No trace of him on any Memorials etc for those mentioned, however there are 12 other named Mowles shown as served or casualties on the Whatfield Roll of Honour.
Perhaps some much more in depth searching into local newspaper archives for that area may yield more for you.
Regards again FoT