London, 14th to 22nd June: Single male in search for Swinging

Hi,

I will be in London (city) from 14th to 22nd of June and I wonder waht a single male - swinger for many years - can best do there to find some sexy encounters.

I all the swingers clubs around my ex hometown and also many international but unfortunately I know nothing in London.

Can anyone give directions?

Thanks in advance
Jo