The health professional’s assessment report helps the Department for Work and Pensions (DWP) make its decision, but it is not the decision itself. If you disagree with the decision, you can usually ask the DWP for a mandatory reconsideration within one month of the date on your decision letter, explaining any factual errors and sending relevant evidence. The DWP may change the decision or keep it unchanged; if you still disagree, you may be able to appeal to an independent tribunal. Check the official GOV.UK guidance for current deadlines and procedures.