I was a volunteer Home Advisor with Age Concern (as was, now Age UK) for 10 years. Most of my work was dealing with filling in benefit clains, mainly Attendance Allowance, Pension credit, but, at times, DLA.
In all that time I never met a single benefit claimant who tried to exagerate their ills or claim something that they were not entitled to.
I also learn that you cannot tell the extent of someone's disability by seeing them around. I had one lady, a bright cheerful lady despite multiple health problems. Seeing her walk round her community holding her husband's arm. She looked the picture of good health. No one could tell she was deaf, suffered from anxiety, had Meunieres disease that caused periods of extreme dizziness and several other problems, but I saw her at home in her 'off' periods, when she was bed bound, unable to even go to the bathroom and in constant pain.
I also got benefits for people who needed and qualified for them but could not cope with the very arcane way these forms had to be filled in. I knew the way to answer the questions in the right way, using the right language, using the words that ticked the boxes. I was very proud of my success rate in getting people benefits they had previously been unable to claim because the system defeated them. I also supported those who had been refused benefit when they took their refusal to appeal, again, my success rate was nearly 100%
Yet I have seen real criticism of people like I was helping people apply for benefits by helping them use the right phrases and language that makes a successful claim more likely.
I have seen far more people living in poverty because they could not access benefits they were entitled to than I have met people claiming unjustly.