There are two Data Roaming "Travel Pass" products available when you click the link in Mark Y's email. One is called "Web", the other is called "Broadband". The prices are the same for each but why are there two products if its all about data usage?
Vodafone do an add-on called Eurotraveller. I pay £3 per day (only on the day that I actually use it) & then all data usage, calls & texts etc are from my inclusive contract. There's no having to buy a set amount of data or calls etc. It's so bloody simple, no thinking about how much I'm using, if I don't use the phone for a day there's no charge, if I use it then there's a fixed £3 charge. It's not the cheapest but I know exactly where I am with it.
Why can't Virgin come up with something similar? I'm sure there'd be LOADS of takers..