no experience of Escort Agency, are you looking for an outcall to hotel or incall?
If you are looking for incall I think you will need to look outside of Bromsgrove, try Worcester or more likely Birmingham (20mins up the M5.) Slim pickings on the AW search for B61 postcode, you do get the occassional touring girl, also search WR9 which is on the outskirts of Brosmgrove.
Interested to hear if anyone pop up on your reverse booking in the area.