I am in the same situation as well where I received ILR Via Tier 2 General 5 year route,
I am applying PBS Dependent Extension for my wife.
In the PBS Dependent application, they are asking for main applicant's BRP number.
1. Is that BRP number from ILR (or) BRP received from last tier 2 general Extension?
2. While filling IHS they are asking for main applicant's visa validity, Although my wife's visa extension is only for 3 years, when i enter my ILR validity, It is calculating IHS Fee for 5 years. So, What should we enter in the validity section?