Also from the terms at the bottom of the page:
General: New 12-month minimum term contract applies. TiVo box remains property of Virgin Media. You must remain at least an XL TV customer for the duration of your new 12-month minimum term. At the end of the 12-month minimum term: (a) if you wish to keep your TiVo service, you will be charged the then applicable monthly TiVo fee; (b) if you do not wish to keep your TiVo service, certain functionality on your TiVo box will be disabled; (c) if you cease to be an XL TV customer, V+HD monthly fee may also apply on top of your TiVo monthly fee. All other services you take remain chargeable; only the monthly TiVo fee is waived. One TiVo box per account.
https://tivo.virginmedia.com/oneofthefirst/prereg