BDSM Dating in London

I’m looking for an experienced older dominant who loves mental domination as much as the physical side, I’m seeking a real experienced dominant who knows the ins and outs and psychology behind it or at least some understanding.
Must have patience I’m a good girl when I want but do have brat tendencies.
I’m looking for mostly online but with occasional meets preferred
I’m married so no judgement and must be discreet and no marks