UPDATE
I was the original poster of this message. After all this time, I finally applied, and received the paperwork to view the files.
As you can imagine, a lot of the information is distressing and sad. However, I did find two important pieces of information.
1 - Next of kin details: I found a 'missing' relative had - not as I had suspected, gone back to Ireland - but had instead gone to New Zealand!
2 - A land deed transfer..of which the location is pertinent to another line of enquiry I am following.
It still doesn't answer a lot of questions about my relative: but it does open new doors to me that may.
MC