Most people don’t have meat for breakfast, so your numbers are off yet again.
Those that have it for lunch are unlikely to be eating much, just a sandwich filling or something, or cheese or eggs or whatever.
Over 85% of the U.K. population eat meat.
It’s unusual for omnivorous households to have more than a couple of main meals a week that are vegetarian or vegan.
I get that yes, reducing meat and fish consumption is good in view of climate change, but I think you’re being disingenuous to be “shocked” at 1/3 veggie 2/3 omnivore main meals.