[Uncle Peter]

Well the big problem is that VM can arbitrarily decide what constitutes "heavy" use as they see fit and may arbitrarily apply Class of Service on whatever type of traffic they see fit (potentially to the detriment of their paying customers), just as they have varied the limits of STM and reserve the right to continue to do so.

Unfortunately the more switched on customers who decide that enough is enough and leave will no doubt be replaced by the unsuspecting people who make a grab for the dangling carrot of 50Mbit, which sounds great on paper.