One of my friends has just graduated from there. She's now studying medicine at a top university. She absolutely loved it, says she's made some excellent friends and the teachers are lovely. She kept one of hers there and never said anything about strangles. Considering she was going from there straight to the yard by us, I doubt that's something she would risk her other horses having.
She chose Stonar over Westonbirt because they only teach polo.
She did say some of the students are proper snobs though, but I guess that's always going to be the case.