From Virgin Media T&Cs
"For customers on the Big Data & Texts tariff excessive use over 10GB of data per calendar month will result in their maximum bandwidth being restricted to 3G speeds (384kbit/s) on our network between midday and midnight."
That's not bad actually. Tethering not allowed, as to be expected.
I'm wondering, if I tether my Asus Transformer (running Android) will they notice the difference from my Android phone?