Hey, totally sympathise system is a mess & nasty. I can see some potential value in a reassessment when someone becomes an adult if award is made in childhood. In some conditions/situations perhaps they might go either up or down on the level of award. But a one off and with a very different process more like - has anything major changes? Nope - ok continue.
They make adults with degenerative / progressive conditions have reassessments on PIP which I think Parkinson's UK is fighting against.
Advice for fighting it;
1.I'd 100% agree re asking for assessors report
- Look on benefits and work website, logo is purple dog. They have lots of resources & forums. The full detailed guides are behind a paywall of £20/yr subscription but are detailed and very useful to have for mandatory review & tribunal.
- Speak to fight back for justice - they can help you to write the land reconsider application, advice on any extra evidence and help you complete the forms. They know the case law from successful and unsuccessful tribunals and where people loose points by not knowing extactly what to include and highlight*
- Don't expect MR to be successful but the tribunal likely will be. He will get a rebate of all the wrongly withdrawn pip from time he list it up to the tribunal (assuming successful) and so hopefully this is helpful to know.
In terms of pip forms key points when filling in:
Not just can they do it - do they use any aid (doesn't need to be a specific disability aid if it's something average person doesn't use) and supervision which sounds key here - supervision direct watching and guiding and also eg w medication prompting. You need to show not just that supervision it aids are not used but what happens without them.
"If I couldn't go to his house for a day he would forget to brush his teeth and shower." Or without prompting he showers but forgets to wash his hair or doesn't wash out shampoo. I put everything down aids a se even light-weight hair drier, electric tin opener, little step and handle to help get in & out of bath. For all ideally you need to explain why they are needed & what is risk or impact without. Getting them shown to be recommended by a professional eg a doctor (GP can mention in notes briefly even) or better still an OT (see below) supports claim but isn't necessary.
List examples of any accidents or forgetting (for things that are scored on pip) to illustrate the help aid is necessary.
When talking about cooking look at the points score - explicitly state (as per truth) eg he is unable to prepare a sandwich or a boiled egg and toast without assistance. Then elaborate as to why and what assistance he needs - If he boils watet he doesn't understand the safety risk and can burn him self or touch hot hob/forget to turn it off. Or he will eat the egg part raw and expose himself to illness.
The other key is timely fashion - less than twice the time it takes a "normal" person.
So for me, yes I can in theory walk to the nearby corner shop but 1. Impact - it causes me significant pain esp w a delay later but 2. It takes me more than double time of normal person. Then you explain why - slower pace and having to stop frequently.
For him it might be that you can say he can wash and dress and dresses independently but 1. Only if you lay out the clothes for him and 2. It still takes him twice as long to do it or basic cooking - he makes a simple meal but requires a lot of prompting and gets distracted or distressed.
As well as how long it takes, it's impact or distress caused (at time or delayed) - so if he can do his part time job with some interaction BUT in doing so he is exhausted and withdrawn for the next 2 days this is worth stating.
Remember you gave to think how long it would take if you removed ALL assistance. Could he choose the ready meal from freezer, appropriately close freezer door after, know which bit to take off or Pierce lid so it doesn't burst (!) read instructions and correctly set the time on microwave.
For finances - document the help you give but also what happens if he has free run at money?
The other thing is to make sure you and others submit supporting evidence, which might be in the form of a diary of 1 week of what you did for him, any incidences/accidents/nearmissed in the last 6 months. With his permission you might ask his work supervisor or colleague if appropriate to write a brief piece on any adjustments they make for him or support they give him. You can decide if it's useful to include.
Professional evidence - if you can get an Occupational therapist to do an assessment the aim usually is to find ways to help with and if they recommend aids for any daily living activities it helps the cases and him as a bonus, plus the report will state his safety and ability to kitchen, dressing etc. Ask your GP for an assessment.
**For anyone with MH conditions note they used to ask for gp records and you submit hospital letters. But they don't ask for psych notes - if these would be useful, which often they are more than GP, so not just the MH letters you get but full notes made on the system by your consultant, then request from your MH provider via GDPR. ## looks like you might now need to also request your own gp notes for tribunals from a news article I saw.
Good luck and hope this helps you and others.