The phone number on the website leads to Noky who used to offer massage from her home in Potters Bar. I think she's also been involved with other shops from time to time.
I saw her a few times 7 years or so ago. Lovely lady (that's her in the blue tunic in the first website photo). Average massage (medium only, not firm enough for me) but absolutely no chance of extras - at least not for me those days.
I don't know anything about this new set up. Maybe worth a try....she may have changed and/or have some naughtier staff?
NB Google maps shows the property as previously being a fishing tackle shop
Please report back if you decide to try