An overpayment is caused when you have been paid more housing benefit than you are entitled to receive. An invoice, and possibly other notices, will have been sent to you about the overpayment.
To reduce the impact of an event on the NHS, there should be an appropriate level of medical cover based on a detailed medical needs assessment and medical plan.
Free to make, appeals against planning applications can only be made by the applicant, or an agent working on their behalf. Third parties cannot appeal a decision.