right to answer my own question
the number in question is an 084486 which is a g8 (or pg8 to virgin) number
(from
http://allyours.virginmedia.com/pdf/...ls_a.pdf?aug08
&
http://allyours.virginmedia.com/pdf/...iffs.pdf?sep08
and changing the sep08 doesn't seem to get me a different tariff guid
)
virgin now charge 7 p to connect and then 2 p per minute
BT not sure what they charge to connect but after that its 1p per minute
Virgins 2p per minute must have been a recent change as price comparison sites still have them down as 1p per minute.. well
http://www.magsys.co.uk/telecom/tarifres1.htm
and supposedly its up to date
hmmmm....