Also, looking at the FR website, it appears that Dinard stops on 29.10.05. After transferring this route from STN in January, a new STN-Dinard flight was started a few months later. It now seems to have reverted to STN.
Maybe LTN’s new facilities are too posh for the likes of Ryanair.
Maybe Ryanair has realised that LTN is a convenient airport to get to which goes against Ryanair policy of sending its passengers to out of the way airports like Stansted
Maybe BAA has done a deal with Ryanair which blocks Ryanair expansion at LTN.