I should also point out to those expecting to get UHD content via the HD channels that this simply isn't ever going to be the case. If SKY do make UHD sports broadcasts available to Virgin Media customers then such content is going to be aired via dedicated UHD channels as opposed to it being made available via the existing SKY HD channels.
SKY prompt customers on their own playform when content is available in UHD and the customer then has to use the provided link to access the content. THe conyent isn't streamed to them via the HD channel that customer iswatching or via the channel the customer received the prompt and link via.
Watch shows, movies and sports in UHD and HDR on Sky Q, Glass and Stream.
www.sky.com
Basically, you are not going to get UHD content via existing HD channels and it will require the content to be viewed via a different channel or streaming mechanism.