Not quite true. Its also the case now here in Austria.
However, the cause of it is simply supply-and-demand here, and a much greater percentage of our pump cost is due to the crude barrel cost so the prices fluctuate daily here, but the last few months the combined market forces have made diesel more expensive.
This is of course different from the UK, where the Govt have set the duty in such a manner as to play with your rectal orifice in the manner you so eloquently described previously.