Hi
We had the same problem. We have been together for 6 years, no kids, were not married (until sept 12) & also living at my OH fathers house. We scanned in a copy of a joint savings account, 6 pics of us at different stages of our relationship, 2 Stat Decs (one from my mother & the other halfs sister), a stat dec from us both describing our relationship, moblie phone bills, all correspondence with the same address basically. We didnt have any probs and the CO did not request any additional info. Hope this helps and good luck
Nat & Gaz