Get an advisor from the CAB to go with you, they are very good but very busy . You need to get on to them ASAP and book an appointment.
Mrs_overall that is ridiculous the assessment is about walking unaided not using a wheel chair . Your friend also urgently needs the help of the CAB ad visors. Let me tell you a true story. A few years back I took a wheel chair user to a tribunal hearing for DLA. We drove 25 miles only to find the hearing was on the 4th floor and the lift was out of action.
I went up to the tribunal office and asked if the interview could be held down in the entrance hall as it was impossible to get the guy up 4 flights of stairs.
They said ''No against the rules, can't do it'' I phoned the benefit centre that had sent him to the tribunal and they said ''Sorry just bring him home''
We got back, next week he got a letter saying his benefit had been stopped ''As he had failed to attend the interview !''
We saw his doctor who was extremely angry with the benefits people and contacted them immediately. He told us that a wheel chair bound claimant should never have even been asked to attend a tribunal, if nessesary the hearing has to be arranged at the claimants home. Any way it took 5 weeks but he finally got his benefits back.
These tribunal doctors are on a bonus they get a £250 cash bonus if they refuse or cancel a claim but get only the basic fee if they approve the claim.
They are not part of the DWP but are subcontracted to do the assesments ,many of them can hardly speak English and it is the only job they can get.