All Equines in Great Britain need to have their passport linked to a microchip and those details recorded on the Central Equine Database (CED) by the Passport Issuing Organisation (PIO). Passports issued after July 2009 will already have a microchip linked to them.
Log in to your Owner Services account to check the status of your horse. If there is no official microchip recorded a vet has to sign a Microchip Update declaration confirming they have identified the animal against the passport and record the microchip number. This does not have to be the same vet that actually implanted the microchip.