I have a question (I'm so nót-technical 😞) is it possible to connect 2 TV's (1 in the living rooom and 1 in the bedroom) to 1 Virgin Media Box with just a HDMI Splitter? Or do I need more or something else?
A splitter should be fine, I use an AV amplifier which basically has a built in splitter and it works fine, run one output to a TV upstairs and one to a projector, so both are 8m+ cables and no problems, even with 4K content. Obviously there is the limitation that both TVs will show the same thing, you can't watch different things in each one.
"Like many video, audio and data cables, HDMI cords can suffer from signal degradation at longer lengths—50 feet is generally considered the maximum reliable length. And it's rare to see an HDMI cable longer than 25 feet in a store. Even online, cables more than 50 feet long can be hard to find."