Which TV box you currently have is the V6 or Tivo ?
If it this one then that is the smallest, but you must also have Virginmedia Broadband to be able to use it fully.
If it is this one then you can upgrade to the V6 above but you are going to need to call 150 or 0345 454 1111, if you do upgrade then it may also entail have a new 18mth contract, this box is the only one you can have if you do not have Virginmedia Broadband.
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