Or downplaying the importance of the Holocaust with sexual nazi references (which he strongly denies, however). The truth is in the original tape.
Expect some good fireworks exploding in a court. Mosley isn't in a good position, politically speaking, but if the names of the leakers and of the organisers of this blatant violation of his privacy come out we'll see some other severed heads and damaged reputations.
After all he's no politician and has no public stance about kinky sex to defend or adhere to, so those matters should be kept private.
Unfortunately for him this rule doesn't apply, for historical and family reasons, to his positions about national socialism and concentration camps.