Fliss
Is this actually described as a compliance interview or rather to ensure that the benefits that you are receiving are correct.
If the latter then in principle it's to see whether you would be entitled to an ESA(IR) top-up but if your ESA(CB) is being reduced by a pension then your won't qualify.
I would contact the advisor anad ask why they are asking for details of your husband's earnings given the claim is in your name only.
Gordon
Nothing on this board constitutes legal advice - always consult a professional about specific problems