I'm an ex mortgage adviser for a huge lender in the BTL market (national brand)
They insist on no DSS for mortgage purposes and on their landlords insurance offering. I asked our chief underwriter at the time why this was and they said statistically, benefit claimants and 15 times more likely to not pay their rent.
There is also the additional issue of people's claims changing and their affordability dropping (see those moving to universal credit). There's also the issue that most of the time the rent is paid to the claimant to pass to the landlord, rather than direct to the LL.
For those getting a top up from the state, I understand the frustration, but if you were putting your money down would you go with the option that was going be 15x safer with the same returns? Of course you would.
I agree it's shit, but landlords insurance is invalid if they take DSS claimants without declaring.
To overcome this, councils need to guarantee rent payments to landlords for benefit claimants & force mortgage lenders to remove this condition from their lending.
My FIL has an 8 property portfolio and is not allowed to rent to DSS claimants, despite him being the same price in rent as local housing associations.
It's not the landlords that need to change