It seems you have the same set up as I have, I had the old Tivo box with the scart 'out' set up going to an RF modulator and its worked fine for years, I now have the new V6 without the scart 'out' so I've bought the splitter and the hdmi to scart converter and its not working. I'm wondering if I've bought the right converter, I've had it from Ebay for £8, could you let me have the details of yours.
I use a Humax recorder which sends out on WiFi so more than one playing at a time the best I can say of V6 is 'it's a good start' now finish it. However the remote designer should be given double pay sheer genius except the weight as I keep dropping it
Be warned not all HDMI splitters work with the Virgin v6, I know that Neoteck and Esynic splitters do as I have used them both I also tried another make that didn't.
I have just returned one of my V6 boxes as i no longer need 2 so am about to sell my Promax modulator with a working splitter, with this unit you only need the splitter and the Promax box the HDMI lead goes into the Promax and connect the RF cable to the in and out connections and you have HD digital (not analogue)TV.
One word of warning this only works with HD televisions.
When I said that you need a HD TV I found that this worked on my 1080p TV's if i set the v6 box video to 1080I but only one of my 2 720 HD ready TV's had a picture, I only had sound on the other. The picture is perfect on the HD TV's
I am not sure about selling this yet but will think about it