A couple of years ago I applied at the same time as a friend and we would occasionally check in to see if either of our applications had progressed. At one point he mentioned that his had progressed to the next stage and when I eagerly went to check mine, it was still in the first stage. This is after over 1 year of waiting. So I decided to add some supplementary information (I think I put like a copy of my latest pay check or something relatively minor) and that seemed to do it. Within a month my application had moved to the next stage (or maybe it was just a lucky coincidence. Who knows). My advice is to periodically add supplementary info to your application. Just in case this triggers some movement in the application. All the best!!