Before I get strangled by all the girls here, I wanted to insist that I think there are loads of gorgeous British girls. Some of the most attractive girls I've ever seen in my life were in the UK (I haven't lived in the UK all my life).
However, I've been to a lot of countries where British girls have a reputation of being ugly. As this depends on the country, I'm putting it down to simply anti-Britishness.
It would interesting if people who don't live in the UK replied and told us if British girls have a bad reputation in their country.