I would recommend Carla @ Annabella's. I saw her on a number of occasions several years ago, but she no longer offers some the kinkier services that I look for in a punt.
Haven't seen any British indies in MK for ages, so cannot recommend.
Maybe if you elaborated on the type of WG (age, looks, busty etc) and any services that you are interested in, others may find it easier to recommend WG's.