Go to adultwork.com
Click Search Members
Select "Female" and "Escort" (or other "Looking for a" fields as per gender, orientation and/or species)
In "Town" enter "Doncaster" - leave other location fields unchanged
I tend to select "Order results by age" cos you can get some corkers over 25 and some right mingers under, but you could enter max age 25 if you want another sort order. If you specifically want to exclude those who claim to be 18 then set Min to 19.
Click Search
Selecting Female, Escort, Doncaster, Max age 25, I get 40 profiles. The first in the list for me was "Ramy..Preety", who offers "Best OWO!!! Barebeak", which sounds pretty good cos I hate when birds try to suck me off with a covered beak. She also offers free parking for her costumers so remember to take an outfit along for her to try on.
Her AW ID at the bottom of the profile page is 35***89 so your next step is to google "ukpunting 35***89" (replace the *'s with the relevant digits) to find out if anyone's posted a review of her (site search might also work but I usually google it).