There is no need to give up meat at this time, imho, as British Animal Husbandry is of a high standard. The Farmers were forced to buy cheap food for their cattle because they were paid so little for the cows they produced for the meat market. Just as they are paid so little for the milk they produce. It is the Supermarkets that enforce the bad practices. Please do not blame our Farmers. They were told the fodder was safe. Buy British from a Butcher who can tell you his meat source.
The use of animal products in cattle food has been banned for a long time. As far as I can tell, the possibility of the cattle having the type of prion disease that takes until old-age to express itself is not possible since those cattle would have been slaughtered long ago. The Prion Disease Laboratory in Edinburgh still investigates cases of suspected prion disease. My neighbour was investigated two years ago when he suffered a terrible neurological illness which was not treated early enough because he was admitted at the week-end. Because his symptoms were atypical, his blood and tissue samples were sent to Edinburgh.
If you do give up meat you will not miss it, in my experience. I use lentils, nuts, beans, quorn, cottage cheese, mushrooms... the list is endless!