I answered in your other thread, but I'll post here too...
The only thing I can think of is some type of MiFi device. I know at least one of our moderators, HarryT, who's from the UK has mentioned using one (not specifically for the Vox).
I don't know if this is a good one or if the price is good compared to others...
http://store.three.co.uk/Mobile_Broadband/MiFi
Basically a MiFi device uses 3G (4G?) to access the net and acts as a WiFi router for devices like the Vox.