Since then, Vodafone has introduced a new policy which makes it more expensive to use data plans for anything other than browsing and email.
This was true up until two weeks ago, when they returned to an agnostic approach. In the process, they broke services for existing customers (such as my company) because they now use lossy compression on some of their connections. It's possible that we might actually move our services over to T-Mobile because their connections are usually more reliable.
Vodafone UK's content optimisation and compression can be by-passed and business users can have URL's added to a permanent by-pass list - just raise it via your account manager/CS team.