It's been found in non Value burgers as well, though there isn't the breakdown there of how much.
Tesco, Everyday Value Beef Burgers - 29.1%
Aldi, Oakhurst Beef Burgers - 0.3%
Dunnes Stores, St. Bernard Beef Burgers - LOQ
Lidl, Moordale Beef Burgers - LOQ
Tesco, Beef Quarter Pounders - 0.1%
Lidl, Moordale Ultimate Beef Burgers - LOQ
Lidl, Moordale Quarter Pounders - 0.1%
Dunnes Stores, Flamehouse Chargrilled Quarter Pounders - 0.1%
Iceland, Quarter Pounders Batch 2250 A 15:27 - 0.1%
Iceland, Quarter Pounders Batch 2218 A 15:55 - 0.1%