When is airport departure tax being reduced?

[Tintagel]

I have been tracking a number of flight prices since November to various countries and I notice that both Aer Lingus and Ryanair's taxes are exactly the same now as they were last November for those destinations.
When did the government expect this reduction to apply from?

 

[gipimann]

March 2011 if I recall

 

[redwood park]

Aer Lingus refunded 14 Euros into my visa a/c account end of Dec. It was unsolicited. I booked 2 seats with them in early Dec for travel in June.