@kunfayakun
Number 5 in my list how i requested it?
Me and my wife both lived with my dad as he sponsored us and council knows right from the very first day we r residing with him. My dad is the council tax payer and getting discount as well.
So i wrote to the council on dad's behalf that HO is requesting a letter from the council that who has been living with you dad and who is the main council tax payer. (Simple)
After 6 days we received a letter in the post.

They mentioned that my dad is the sole tax payer however me and my wife has been living since we moved into this property they mentioned the exact date.
It is more than enough to prove that me and my wife are house hold member with the sponsor.