Part of the difference is the number of horses AHA registers each year compared to the Hackney registry. It's going to be much better to narrow down the field (possibly by color or markings) to begin a reasonable search than it would be for AHA.

ETA:   (I guess I got "submit happy")  CONGRATS CK!!

msmith wrote:
"Revenge is a dish best served…with cutlery your roommates threw on the lawn."