Same here, I saw the announcement about the new cheaper packages, Vivid 200 is down by £8 a month but only for new customers they won't drop the price or offer higher speeds to existing customers. I'm currently monitoring my real-time usage on my router to see if I can live with around 70Mb which is what I can get from Sky for less than half what I'm paying Virgin a month.
Got this response on a web chat with customer services yesterday - its appalling. Keep gouging your existing customers but offer lower prices to get new people on board. Might contact Offcom
Vivid 200 Gamer (Cough), SH3 (box of sh**) Asus RT-AC3200