Hello, im guessing you after a recommendation rather than 'how do you fine someone?' - as obviously a search on the other site with the service selected and by number of ratings will turn out a lot of names.
I can vouch for 'Pissing Queen'
who still works out of Barking by the looks of it:
External Link/Members OnlyExternal Link/Members Only(im new to posting, hope I have linked in the right manner?)
This looks like she has had to start a new profile, as she had massive feedback at one point.
Havent seen her in probably 4 years but she was nice natured and genuinely into it with few limits with the ws. It was a house as well which was a nice touch.
I did take a look and see her prices are much more hiked than when I went:
"15 mins = £80, 30 mins = £120.00"
'yes £20 for watersport and swallowing' (watersports)
Probably why I havent been back, thats too much, on the plus side her swallow ws service was extra even back then but I do remember she never charged me the upgrade
Best of luck