It's filmed in London based on info in the clip, odds are it was not any specific tickling site but on of the many casual foot fetish roamers that approach women and offer a small payment for basic feet related viewing. Dozens of sites and C4S that do that. With no watermark it is going to be a matter of lucking out on someone who's seen the site and clip.
You may have more luck asking on foot fetish boards.
Myriads