Have you actually talked to a microbiologist about this? It’s not safe at all.
E.coli might have some harmless strains, but you have no guarantee which strain is present. It’s also not the only dangerous pathogen found in milk. Did I mention raw milk is often contaminated with bacteria from cow poo?
Just because something is fine for a calf doesn’t mean it’s fine for you and vice versa.
Edit: oh yeah and I live in England. We have decent food safety standards here and that’s why raw milk isn’t sold at supermarkets.