As pepsicola Boy Said, Me and you Spa will definately do it. Book for a waxing and enquire about a HE at the end while you are in there. Was £20 for the HE on top of what ever the waxing cost is.
The other place is Acam sisters. Andrea does all the waxing there. definitely dont ask for a HE over the phone as you will get nothing, and she might not do it first time. Same extra cost on top as Me&you.
Both are pretty good for the waxing, although Acam is slightly cheaper, but less certainty on the HE.
I did go to Alina in Chingford and Jaonna D (also chingford), but the Waxing was terrible for both of them. They may have improved since, but at the time they clearly had no idea what they were doing.
I have found a few others that do waxing, but not that will do HE as well so far. Any other suggestions in the Woodford/loughton etc are would be much appreciated.