Do they not have to say what percentage is actually meat? Where I live (not UK), if I look at, say, ham slices, the ingredients list will say something like “meat (85%)” and then water, and salt and other things. Cheap meat is only about 55-60% meat. Fancy packages are like 92% or 95%. I’m not exaggerating even slightly. I bought ham yesterday and settled on the 85%.
Edit: I checked beef and chicken-turkey mince in my fridge. 82% and 92% (77% chicken and 15% turkey).