Until Aer Lingus opened the LGW-MUC route or, for that matter, Ryanair opened STN-FMM, the only LCC route between London and Munich that really lasted was Easyjet on STN-MUC.
Given the distance and even the airport types (i.e. big airports near big cities), fares on this route were very much on the high side compared to other LCC routes.