Check out some.of my reviews, I tend to see submissive and kink friendly girls, particularly in the past few years.
Depending upon budget you could peruse
External Link/Members OnlyBut probably at least half the subs I've found have just been through vanilla meets and often you'll catch a vibe that they're sub and into a bit of kink, and I float the idea of a more kink oriented meeting, nothing better than renting one of London's dungeons and taking an enthusiastic sub there.
My two favourites have bother retired unfortunately, so I don't feel able to make a specific recommendation at present.