Rightly so if it has been sold as beef, mutton, pork &c. by bent meat processors and suppliers, and there is a slim chance that some of the horses that provided the meat may have been treated with a drug that is apt to disagree with humans.
Actually, I suspect that the English are more upset about the fact that it is horse - I have no reason for thinking this but I suspect that it is the case, and it is an ideal subject for the tabloid press to "get their teeth into"!
Nothing wrong with horse-meat; in France I ate it raw (Cheval Tartare) and very good it was too.
Until the next time