The info below is from https://www.virginmedia.com/tv/stream
The Legal Stuff
Stream from Virgin Media: Virgin Media broadband required (min. 50 Mbps). Not available with other Virgin Media TV services. Compatible with Hub 3 and above. Stream box requires an HDMI cable connected to TV. HD TV set and a Stream box connected with HDMI cables required for viewing HD channels. Number of inclusive HD channels depends on package. 4K compatible TV/device required to watch Ultra HD. Stream box and remote remain property of Virgin Media.
You can view the technical specs on page 3 of the following pdf
Based on web search results, you can connect a device with HDMI on an older TV by using an HDMI to RCA converter. Plug one end of the HDMI cable into the device and the other end into the converter. Then, take the RCA cables from the opposite end of the converter and plug them into your TV. From here, be sure to select the RCA input source in your TV’s settings