Swiper is right about cheats - and it is unfortunate that current procedures are a result of those who would claim fraudulently. However, claimants do benefit (no pun intended!) from these procedures, as legitimate evidence/documentation prevents claimants from cheating the system.
In reply to the query of those without bank accounts, the rent money is paid straight to the landlord and for council tax benefit - it is taken straight off the bill. If a bank account has previously been on record, then proof is required from the bank, of closure of the account/s.