Mortgages on benefit income alone

Recently, i have seen some people claiming to be accepted for mortgages on schemes while their only source of income is benefits with a savings deposit? There are some benefits however that are not accepted like temporary ones, but they accept long term benefits or a combination of of income and long term benefits.

Also, can a LA annual direct payment income be used in the calculation along with benefits and other income?

Direct payments MUST be used for care needs only, not really income.