41-year-old Jesse Schust, from north London, said the written judgment meant far more to him than the £4,800 damages he received.
Speaking outside the court, he said: "For me it's a tremendous relief to have a vindication after 10 years that the treatment that we received from the police was wholly unjustifiable.
"It's deeply upsetting to know that the police had many opportunities to make other choices and it appears that they stuck to a pre-set plan because of faulty intelligence."
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The RSPCA is working on a prevention message to help resolve the increase of abuse of horses and donkeys within the west country.
Outbreaks of rain and drizzle could turn heavy at times, with foggy conditions persisting over main coastal areas. Highs of 13 or 14 C
There will be outbreaks of rain and drizzle today which could turn heavy at times. Maximum temperatures around 13 or 14 degrees