D3G,
I went to the initial Ryanair selection day down in Gatwick in early Jan. The format is all pretty relaxed. You arrive at 9, have a coffee, the guy from Ryanair arrives a little while later he then gives a presentation on the company and afterwards there is the usual q&a time. After that each of you go in for an individual interview/talk with him.
I found it to be a really relaxed affair and am now looking forwards to my sim ride in the next few weeks.