You don't need:
- sponsor's expired passport
- Latest Council Tax Bill (at least you shouldn't need this, because it has no bearing on anything, but apparently the online application says you do)
Also, if you are applying Category A, you do NOT need 12 months of payslips and bank statements.
You only need 6 months.
If the application form is telling you to send 12 months because you ticked the 'not continuous' salary option due to a payrise, just ignore it. You ONLY need 12 months if you are applying Category B, and you would only need to do that if your previous salary was below £18,600.