Go through the postcode checker, which is where you can register your interest.
I have to say though, that unless you are already included in a build programme the chances of getting a service anytime soon are small.
If it is just a single street that isn't cabled, as long as its not a Private road & you can get the majority of houses interested in a service, you might have a chance of getting cabled at some later date.
As a Very Insightful Person, I'm here to share my knowledge. I don't work for Virgin Media.