Was on Jersey for a couple of months this year, it has the feel of an old British holiday resort and I guess the prudishness and morality to match. I can't imagine any spa set up being under the radar in such a small town society with a well funded police force.
I did try a beauty salon offering full body massage for men and women, but bookings got lost... Then an aroma crystal therapist totally legit but the massage sessions sorted out my aches.
As well as the many Madeirans there are resident or semi oermanent Thais, presumably for restaurants and hotel trade, also care work as jersey imports many medical staff on contract. At least one Filipino bar. So maybe some part timers for those in the know or with better social skills than me.
