Me and my wife are going to submit our documents at around the same time. My supporting documents are almost identical to yours but I kept my letter much shorter (I don't know if thats a good thing or not), but at least you gave each section a title so they can decide wethe or not they want to read it.
I haven't signed my passport copy, but I did getit certified by a solicitor (as well as drivers licence copy and house deeds).
I wish you good luck.
