Bull. Beginner classes are beginner classes. If there are prerequisites to a class, they should be listed somewhere you can see them before signing up for the class, no matter where that class is held.

Oh, I totally forgot: my wonderful, lovely, amazing teacher now has beginner classes in Cambridge!

http://amirajamal.com/Cambridge.htm

She really has down the whole praise and encouragement plus constructive criticism formula for teaching, and she is an amazing dancer with decades of experience.