Hi Davy,
when I had to stop working (about 6yrs ago) and went to sign-on at the Job centre for the first time, I had an appointment with a disability officer

Who was very sympathetic and explained the interview was just to record my details, and make sure I was getting the right benefits. She also asked me how my disability affected me, in relation to working and if given the right support. I told her that I could no longer do my job because my health had deteriorated and that, no amount of help could be put in place to make it possible to go back to the job I had.
I was asked if I wanted any training to do something else, such as what, I asked. I am a qualified electrician, electronics engineer and teacher.
By this time I think, she had come to the conclusion, I had no intentions of going back to work.
I have never been called back again. I think the main reason for contacting those on benefits, is to make sure the claim is genuine.
I would not feel threatened if you are call in for any reason, just tell them you circumstances and explain your condition. You don't have to lie, but lay it on thick, as they say
Remember, there are nearly 3 million unemployed and hardly any jobs available.
I look at it this way, who wants to employ a 61 year old man, who is disabled, in a wheelchair? Give the young ones a chance!