Hi Annie
Advice about the Covid-19 is an ongoing situation - so it would be wrong for us to speculate about what the Assessment Services may be doing next week. If the appointment goes ahead, they will not knowingly send someone who is unwell and assessors are sure to have had advice about self-isolating themselves.
The assessor does not ask to see any aids or equipment in your home.
BIS
Nothing on this board constitutes legal advice - always consult a professional about specific problems