The advice you've been given by the previous poster would be correct if channels that you should have in your package are greyed out but should be included. You've described a different issue - W02 is a classic "loss of signal" error (online advice is here )
"Loss of signal" errors on live TV are a classic sign of a signal fault. If you've rebooted your box once, then there's likely a fault somewhere, so call VM and report it. You're likely to need either an engineer visit or a replacement box, depending on what VM's remote diagnostics turn up. They can do these while you're on the phone to them.
First check the automated faults line for any existing issues in your area that could be the cause: 0800 5610061. If nothing's reported, assume VM don't know about your fault and you'll need to call them.
150 from a VM phone, 0345 4541111 from any other phone - choose the options for "I have a fault with my TV service"
I'm a Very Insightful Person, I'm here to share knowledge, I don't work for Virgin Media. Learn more
Have I helped? Click Mark as Helpful Answer or use Kudos to say thanks
Thanks for your help everyone. I rang Customer Services (only held for a couple of minutes) and an engineer visited the next day. He identified it was a network problem outside. The network engineers arrived the same day and everything is now working perfectly.