Useful Websites:
https://www.gov.uk/employing-people-to-drive
https://www.gov.uk/vehicles-can-drive
https://www.gov.uk/government/publications/d8881-request-by-a-company-about-driver-entitlement Form D888/1 Company request re driver entitlement
http://www.adlv.co.uk/ Association for Driving Licence Verification