It is a possibility as Patrick was in the Royal Artillery however it was, and is, a large regiment and would have been spread about. I have a friend who is ex-RA and who is eligible to join the RA Historical Society but in all likelihood it will be a case of going to Kew and looking for Patrick's army record. From my experience of looking at Cedric's army record, they contain quite a lot of information about postings as well as next of kin, so it might well shed some light on what he got up to and some additional family info.