If you’re using an iPhone and have a Vodafone UK monthly subscription, there’s a special wireless network SSID (VodafoneWiFi) that bypasses the annoying Virgin Media login screen everytime you’re in the London Underground (as with the SSID VirginMediaWifi).
Unfortunately there’s some sort of Apple issue that doesn’t let it connect directly as it asks for a username and password instead of using the SIM authentication (EAP-SIM). This config profile forces the iPhone to use the SIM to connect itself to VodafoneWiFi. Enjoy. Click here from your mobile browser and hit Install
UPDATE for 2020 – still works on the tube, though a little unreliable on newest iOS 13 as maybe 20% of the time it will refuse to connect. I suspect that’s an access point problem vs a phone problem. Either way this is as good as it gets!