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According to one of the meaters at work, a sausage legally has to have a certain amount of dead animal in it to be called a sausage. Otherwise it has to be called a banger... not sure if it's true but if so I can see the argument there. Sort of. But it's still borne out of people's unwillingness to accept that their indulgences in meat is purely a preference and therefore banning/reducing the visability of alternatives makes them feel less bad and insulates them from their consciences.
Same for sausages, you already distinguish on the type of beef, pork, turkey sausages are all available so it's 0% confusing to see "quorn sausage". WTF EU?