Perhaps this is localized to the UK?
I've taken all my tests through VUE because they have a test site just 3 miles away. The closest Prometric site is about 18-20 miles.
The security policies are supposed to be the same and determined by the vendors. If some test centers are lax, its probably that individual test center and not Vue or Prometric. I'd think there would be just as many incidents of people cheating at Vue as at Prometric.
My fear is this move will make tests much harder to schedule. The many people who now go to Vue will have to go somewhere else and how will Prometric accomodate them unless they open a lot more sites?
What are people's personal experiences at both Vue and Prometric?
The center I test at is both a VUE and prometric center, so this change will not effect me very much. For those of you that it will cause problems, start raising hell with Microsoft. If you let them know, they might do something about it, but if you don't, they have no reason to make changes.