Imperial units and the BBC

In this article on the BBC website about a train crash. They talk about the train traveling at more than 100 mph. I was under the impression that England used the metric system and I am surprised to see that the article talks about miles per hour and not kilometers per hour or even kilometres per hour. Is the article changed for US consumption? It seems to me that that is not the answer as it would be a lot of trouble to track where my computer is just to do this minor conversion.

http://news.bbc.co.uk/hi/english/uk/england/newsid_1979000/1979677.stm

We use metric weights and measures but road distance and speed is still in miles.

We are sort of half on half regarding the metric system. Although most thing bought in the shops are in metric, road distances, road signs and speedos on cars are still expressed in imperial units The railways use even stranger units. Distances on the railway track are expressed in miles and chains.