Make sure you advise your clients correctly about the need for horse passports. You can download a flyer for display from DARD website http://www.dardni.gov.uk/2012-horse-passport-flyer.pdf
Link to Weatherbys Identification of horses booklet:https://www.weatherbys.co.uk/sites/default/files/Identification%20of%20Horses%20Booklet.pdf
Link to DARD info on horse passports:http://www.dardni.gov.uk/horse-passports-q-and-a.pdf
Horse passport agency:http://www.horsepassportagency.co.uk/