permitted work and mortgage interest

There is hardly any information about this anywhere. As far as I can see PW earnings are disregarded for SMI same as HB but I’m reluctant to advise client without confirmation. Anyone know any different?

Surely they qualify for mortgage help due to being on an income related benefit, and if permitted work doesnt change the fact they are on IR benefit then it should not impact on mortgage relief?

Only if the income related benefit stops would the mortgage help stop is how i read this