No Advocacy for Tribunal Hearing

My son was refused DLA (Higher Mobility) when he turned 16 at his renewal(Feb 2010). He was in receipt of this from 2008. In summary, he has low bone density (vitamin D deficiency) and severe IBS. His consultant advised that due to his IBS, he cannot absorb relevant vitamins to increase the density in his bones hence bone pains. I was unable to get assistance from DIAL to assist me completing his form and I did not 'tick' any of the boxes as to how far he can walk but gave examples of him not leaving the house on his own since 2007 and me having to transport him everywhere. I did not want to tick the boxes as I could not answer the distance questions. I had contacted different advice agencies who could not represent him but advised me to send in all his medical evidence and any other evidence of how his medical affects him. I sent in everything from 2007 including letters which show that I had problems getting him diagnosed on the NHS, him being home schooled for a while. Problems with the school getting him reintegrated back into school as they did not know how to deal with his condition, negative social services intevention, etc. It was a lot of information. Atos came out to do a medical assessment and asked him if he would walk 10 mins in a normal manner even though I told the GP that he had not walked outside on his own for the past few years. Someone was also with him. He lost his renewal because of this statement. I asked DLA to write to his consultant for further information but they refused. I could not find anyone to represent him at his hearing on 30 November 2011. The report from ATOS is ineligible. The statement of reasons concentrate purely on the statement that my son said that he could walk for 10 mins in a normal manner. The Panel was very intimidating especially as he 'walked in normally'. This was not the day he had one of his attacks. I had taken more medical evidence (current investigations) and think I got the Panel's back up. Judge [mod edit, cannot publish names] said that he had not seen so much papers and on one hand, 'I should know when to draw the line under it' even though he could not tell me not to submit any further documentation. Due to the paperwork I had submitted, they could not hear his case but still asked me questions about his care. One of the panel members reminded him that he should not be asking me questions as they were not going to hear it but he said he was making notes for the next panel members who would hear the case. He also asked me what level of benefit was I seeking for my son. I replied, 'higher mobility, what he was on before'. The Judge replied, 'oh really' and sat up surprised. I wanted to burst into tears as I felt they had already made their decision before we went in. He still persisted in questioning me about his care needs. I told him he did not qualify as he was at school all day and he agreed. The Judge said that they were not concerned with current evidence, only evidence at the time he lost his renewal but I had been told to get up-to-date medical evidence. What concerns me is that on the Decision Notice, it is noted in the Directions to the Clerk before relisting 'the Chairman and Members of today's tribunal are not excluded from further involvement in the appeal'. The case is due to be heard on 30 Jan. Apologies for the late request for assistance but I have been trying to get representation but everyone's budget has been cut and this service is no longer offered. I really have no more strength left as his illness over the past years really took it out of me and obviously had an impact on my own health. My son is shy and does not speak out which is what caused a lot of problems in the past with him being misdiagnosed and the NHS not carrying out relevant tests. Is it normal for a panel to be involved in another case, I thought his hearing was meant to be impartial. Any advice please, I'm at my wits end