Unfortunately it is bad wording in the letter. It will be in relation to your broadband
For what is going on see this thread
http://www.cableforum.co.uk/board/34...discounts.html
EDIT: another one here
http://www.cableforum.co.uk/board/59...r-service.html
Basically they are cleaning up accounts, removing discounts that are not valid based on Virgin's official price list