Had this problem and I think it is down to "built-in" redundancy on new devices rather than failure of old style technology. Had to go down optic cable route, scrap my (15yo) £550 home cinema system and buy a sound bar and blue ray player.
Have you checked out Neet on Amazon? I had one a year or so ago and it split a Sky signal, but only when it came via my AV Receiver. If you contact them they will, no doubt, let you know if they have what you need.
They will probably try to sell you more cables, but the splitter should work with any cables.
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**giggles at Virgin boxes**
They will probably try to sell you more cables, but the splitter should work with any cables.