Check any cables and reboot any routers, modems or other network devices you may be using.
Allow Chrome to access the network in your firewall or antivirus settings.
If it is already listed as a program allowed to access the network, try removing it from the list and adding it again.
If you use a proxy server…
Check your proxy settings or contact your network administrator to make sure that the proxy server is working. If you don't believe you should be using a proxy server: Go to the Chrome menu >Settings>+ Show advanced settings>Change proxy settings…> LAN Settings and deselect "Use a proxy server for your LAN".
If it works elsewhere outside of that network you have already narrowed down that it is an issue with the network, I would contact the network administrator of that network and ask them to check the log files, possibly the firewall or proxy to see if the virginmedia.com is blocked.
Can you ping oauth.virginmedia.com if you cannot then certainly being blocked on that network.
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Contacted our IT dept today and they confirmed that nothing is being blocked and that the problem lies with connection and configuration to VM. This has only recently occurred since last weeks "service upgrades" and the problems that VM were experiencing.