Natural England has published guidance detailing how it assesses the condition of Sites of Special Scientific Interest (SSSIs) and the enforcement process for landowners. It defines six condition categories: favourable, unfavourable recovering, unfavourable no change, unfavourable declining, part destroyed, and destroyed based on whether designated features meet site-specific monitoring targets, with favourable indicating full compliance, recovering indicating progress under appropriate and timely actions, no change and declining indicating failure to meet targets (with declining worsening over time), and part destroyed or destroyed indicating irreversible loss. Natural England carries out condition assessments through site visits, typically at least every six years depending on how quickly features change, assessing each feature against defined standards and notifying landowners of results and any required management changes, with summaries usually published within six weeks. Where sites are not in favourable or recovering condition, Natural England applies a staged improvement process, beginning with voluntary management agreements, followed by formal management schemes where necessary, and, if non-compliance continues, issuing management notices requiring specified works, with potential enforcement action including prosecution, recovery of costs, or compulsory purchase, subject to a right of appeal to the Department for Environment, Food and Rural Affairs.