Hi Louis, I did the same as you (extended trip to be with my lady and then help her complete the application).
One thing I did used to do was give power of attorney to my solicitor...as I was going to be away for extended periods. Handy for dealing with banks, councils and similar.
If worse comes to worse you could have copies of documents DHL'd out to you, as long as someone here has access to them. Hopefully that won't be necessary of course, but wise to cover all bases.
Anyway, I'm sure one of our experts will be along shortly to give you that important list, or at least where it can be located. Good luck.
Oh, there you are... Terpe to the rescue while I was typing.