South East is a big area fella. Might help if you give people a clue where you're thinking of, unless you're willing to travel miles?
In fairness to the OP, it won't be a long list. There are hardly that many decent threesome options.
Any recommendations of a pair of escorts who do a genuine threesome (ie 3-way interactive) anywhere in the SE would be welcome.
It's still on the 'to do' list, so can't personally recommend. You may have to travel to London.
Just do a search under 'threesome' and 'duo' on this website, and you'll find a couple of reviews.