Thank you for your question, it can be a bit confusing;
If you are in a couple you can receive the severe disability premium if:
~ you both receive a qualifying disability benefit (or one of you receives a qualifying disability benefit and the other person is registered blind); and
~ you have no non-dependant adults living with you (unless they are also receiving a qualifying disability benefit or are registered blind)
Gary
Nothing on this board constitutes legal advice - always consult a professional about specific problems
