Eagle eyed ADSLGuide have noticed subtle changes in the terms and conditions (T&C) of users who sign up to Virgin.net.

Although customers sign for a one month contract, as is becoming the norm these days, Virgin will charge a £50 cancellation fee to those who leave within twelve months of joining.
The reasons for this are quite simple, Virgin defer the cost of the free modem and free connection working on the business model over a twelve month minimum term, in effect users who join then leave soon afterwards cost them money!

As migration between suppliers becomes easier the days of free activation combined with short contracts seem to be nearly past, unless there are 'claw back' clauses to recompense ISP's.