networking is what im specialising in my degree and network design is my thing.
as virgin is fibre as well you wont get any signal loss though fibre thats why virgin are the no.1 suppliers. i also have virgin installed in my uni house and it has a black netgear router and i have to say its shite with range. I have an old N router spur'd off that currently for it to reach my room because if i connect to it i get 1 bar 24mbits but i get a very big packet loss with my other router tucked away in the corner of a room away from anything electrical im now getting 3/4 bar and very good speed.
do an broadband speed test if you feel its the broadband letting you down but remember its up to 50megabits so 50megabits realistically is 6.25megabytes.
hope this helps mate