Sounds like you might have the newer Stream non-recording box.
TiVo & V6 were withdrawn for new customers several years ago in favour of TV360, and VM are making continual efforts to encourage V6 users to migrate to TV360.
If you're in one of VM's full-fibre areas, then neither V6 or TV360 are available in any case, and only Stream is available. If you're in a traditional network area, then TV360 is available via telesales if you specifically request it - at a £50 charge if memory serves me correctly.
There is a weblink somewhere, where you can check which network area you're in, I'll hunt it out unless someone else beats me to it. Otherwise use the "what services are available where I live" page, and see if 1Gig broadband is available in your area.. if it is, you're a full-fibre customer.