From July 25th:

Daily data charge of 50p (up 20p) up to 25MB then £2 per MB.

A minimum call charge of 21p.

http://www.virginmediapeople.com/flex/

In addition Virgin customers will be able to use Orange masts from the autumn. It was supposed to be earlier this year.

Its almost as if Virgin dont want PAYG customers anymore.....

I dare say the remaining people on the current PAYG tariff are subsidising those on the cheap contracts.