I flew into Kerry about 18 months ago.
I seem to remember the fee being about ?24.
I wouldn't have been bothered about that, except for the fact that when I rung to get PPR, I enquired about the landing fee. I was told it was ?6.
When I was asked for ?24, I queried it, and was told, "Oh yes. The landing fee is ?6, the airport development fee is ?6, and the passenger service fee is ?6!"
I put it down to experience, and now I ask about the landing fee, and "Are there any other fees that I will have to pay?"