Why does this super secret independent spy agency just let the candidates for Lancelot walk away when they wash out of training? I don't even remember any sort of "Never speak of this place or us or we will find you", type of talk when they leave.
Since the candidates know who members are, where their headquarters etc... are, it seems like there would be a little more caution.
Since Charlie recognizes Eggsy at the end of the movie we know there isn't any sort of memory drug used, so what's to stop the wash-outs from being a danger to the society?