Make sure it's electronic. Make sure it's NLIS.

The National Land Information Service (NLIS) connects users directly to land and property information held by local authorities, central government and other organisations that provide official sources of land and property data. It offers the highest standards of electronic property search accessibility available on the market today. All searches ordered through NLIS are classified as ‘official’ searches because they are sourced directly from and interpreted by the local authority and other official data providers and therefore, all statutory indemnities remain preserved and transferred to end customers.