Well, the thing is that, the congestion charges, they were introduced first as a trial, so they were introduced in January and then abolished again at the end of July, followed by a referendum, and then they were reintroduced again in 2007, which of course was a wonderful scientific opportunity.
De opstoppingstaks werd eerst op proef ingevoerd, in januari, en eind juli weer afgeschaft, gevolgd door een referendum dat hem weer invoerde in 2007. Een buitenkans voor de wetenschap.