Rereading the story, it certainly implies that they were buying the same journey in different locations but the final comment: "A spokesman for the airline said: ‘Passengers pay for flights in the currency their flight departs from.’" implies the opposite.
If it is the former then Cryanair is breaking EU law. If it is the latter they are not.
Edited to add. I believe Cryanair's charges are the same in £s and in €. i.e. what is €30 is £30. At one time the exchange rate was close to 1 to 1, but not any longer, but they have neglected to fix this. (And be careful what you ask for - they won't reduce the £ amount, they'll increase the €
Last edited by ExXB; 6th May 2013 at 15:34.