BDSM Dating in London

As a couple we are looking for another girl to try threesome (i did before and enjoyed, it would be first to my partner and i want to give it to him). If you are sub and into ***, even better, but it's not essential.
For different occasion we looking for another girl who is into poop-play, partner wants to try and i am not into it, so i told him we can find someone else instead.