Or how many English language students are wg's?
Almost all of the wg's I have seen are English language students. I would say 99%.
I was walking outside a hospital, near London Bridge about 2 years ago. A really fat and badly sweating man was walking and behind him was a Japanese women, I would say in her early
20's wearing a rather short skirt. Her stockings were clearly visible and the man was openly abusing her.
She was smiling when I wondered if she was for 'hire'.