The 200Mb service is available on Virgin's standard HFC network so I wouldn't read into that too much.
What I have noticed is the majority of infill areas around here have no copper phone connection available on the checker - including my friends street.
He's called Virgin and they just said we can't provide a phone line and that was that.
I'd keep your BT line until Virgin manage to sort a VOIP solution out.
BT BroadbandInfinity 2