All horses (this includes ponies, donkeys and other equidae - including zebras, other exotic equidae but not semi-feral equidae residing in designated areas) must have a passport and those which were identified after 1 July 2009, must be micro-chipped before a passport can be issued.
Horses and other equidae must be accompanied by their passport at all times, except when: stabled at pasture moved on foot and where the passport can be retrieved within three hours
Other legislation is contained below relating to the protection of animals during transport.
Transport of Horses & Ponies - Passports & Welfare
The Welfare of Animals (Transport) (England) Order 2006