You cannot cancel via email, as you have to pass Data Protection checks. This can only be done over the phone, or via online chat. Call 150 & select option 4 then 5.
Virgin TV on its own with the "Freeview" equivalent Player TV is not worth having. You are looking at paying out a TiVO charge to rent the box (probably around £11 -12). Freeview & Freesat PVR's may put you back around £100 to start with, but there is no further outlay once you purchase the box (& aerial/dish if required).
Cable customer since 1993. Services: FH TV, Sky Sports & Movies (2xV6), Talk Anytime Phone, VIVID 350, Virgin PAYG Mobile