Flexible working request


I was wondering if anyone can help me to fill out a flexible working request. 

On the form it says I need to write what affect this will have on the company and colleagues. I am applying to go from full time to 3 days a week. 

I also wondered if this request shouldn't be a reasonable adjustments request instead. My boss have already made it clear to me that the business can't accommodate part time working, but it's due to my disability that I would like to request to work 3 days a week.

Not sure where I stand with this, I already have a employment tribunal claim against my work and they have admitted all their failures but is now sending me to a specialist because they say autism doesn't fall under the equality act. 

I really want to work and I am worried I will never find another job. 

Hope someone can help me with this flexible working request.

Thank you.