Last time I looked a whole sh** load of people in England were descended from the Norsemen. In fact William the conqueror and his people(the Normans)were descended from Nordics, so the fact that there are mostly blonds in that movie is spot on. Lots of blonds in England.
The time traveler is the only brunette. However, it should also be noted that in the more recent movie, all the Eloi were brown skinned with dark hair; indicating that they were aware of the Aryan nature of the original and went to the opposite extreme.