Thanks a lot for your reply, it's really informative. If I wanna cut the fee, I believe I can extend my tier 2 visa for another year at the end of my fifth year of tier 2 visa, together with my wife visa extension, then use the standard service for ilr. Less time pressure as well I believe? Any advi...

Hi, Both my visa (Tier 2) and my wife's visa (Tier 2 dependent visa) will expire on 6 October 2020. I first enter UK on 1 October 2015 and my wife on 1 Feb 2019. My plan is to get myself switching to ILR while my wife continue on her Tier 2 dependent visa. Questions are: 1. I can only apply for ILR ...