OK - I have emailed and called the forum team and this is what they have said.
Link to VIP 50 Deal -
http://community.virginmedia.com/t5/...010/m-p/107310
For VIP 50 customer i.e. customer who already have VIP package + 50 MB broadband - you should be getting the SKY Prem HD channels free, if not follow the below.
For VIP 20 customers i.e. VIP Package call 150 and ask to be passed direct to retentions - state VIP 50 Bundle from 5th August 2010 ref Mark Wilkin - Help & Support forum manager.
VIP 20 customers you will end up paying an extra £5 per month to get VIP 50, meaning you upgrade to 50mb Broadband and you get Sky Prem HD channels for free.
£20 activation applies
I have being told this package will become available via the internet soon.