Benefits and Work
Benefits and Work website says,
“Whether you are making your first claim for PIP, UC, ESA DLA or AA, having your award reviewed or appealing against a decision, our guides will ensure you are not left bewildered or missing out on important information that could make the difference between failure and success.”
Many guides are free, however becoming a member of Benefits and Work (at a reasonable cost)will allow you to access more of their guides.