Things I'd try, if you haven't already...
> Log into your Virgin router (username and password should be on the sticker on the back) if it's not in the front page of the web interface for your router, there should be somewhere in the web interface where it shows what devices are connected. If the switch you put in your picture is managed, then it should be listed as a connected device with a name (Netgear in the name) and and IP address.
> If there is an IP address for the Netgear switch, copy and paste this into another tab in your browser. I'm guessing the switch will also have a username and password, which will also be printed onto the back of the switch. So find that, get into the web interface on the switch and in there, you again should see somewhere where you can see the connected devices to the switch. Is there anything in there? If they are connected, the Wireless Access Points should be listed with names and IP addresses too.
> If your Netgear switch isn't listed as a connected device on your router, then you need to verify the cabling. From your picture, I'm guessing you can't tell which one runs from the router to the switch? If you can tell which one comes across from the router, I'd get a laptop, disable the wifi and plug the cable in. Once plugged in, if the cable is working well then you should be able to connect to the internet, despite your wifi being disconnected.
I'm not familiar with the brand of Wireless Access Points you have, but I'm guessing they have some sort of web management interface? I'd also investigate on how to connect to that.
The switch should have loads of little lights flashing lights on it, where the cables plug in, or possibly smaller lights relating to each port in another area of the switch. If there's no lights, then it's not connecting to the devices.
None of the above will solve your problems, but may highlight if there's something not connected or help you get to the bottom of why it's not working.