english: 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.
non_english: Справа в тому, що цей збір спочатку ввели як експеримент. Його запровадили у січні, а наприкінці липня скасували. Тоді провели референдум і 2007 року ввели знову, надавши чудову можливість для дослідження.