Is there a way to tell a British from a French just by looking at them?

You could tell someone from the south coast of france, who often look like Italians, from a brit. And you could also probably ume that a red haired person is more likely to be British but beyond that there isn't very much difference between the two peoples, the genes are very much mixed together. English people do however tend to have a slightly higher (about 4%) rate of blonde hair than french people in general, who have a higher proportion of black haired people. Britain also has a high rate of ginger hair in comparison to most other european countries.