I suspect Ben was checking whether you were in Scotland or not, apologies to him if that's not the case.
The TiVo should have access to ITV "CatchUp" programmes using VM's in-house OnDemand system, but to use the ITV-X branded app you will need to change your TV box.
Either the V6 (same software as you have now) or a TV360 (newest software, very different) both use the same physical box and support the ITV-X app. VM will very easily sell you a conversion to TV360, or if the software doesn't suit you - a V6 is a clear upgrade on the TiVo, will be familiar to you with much newer hardware.
Whichever you choose, VM home broadband is a requirement.
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