I am turn on my sky tv on sky q, and I have gone onto channel 108 sky witness so where on the screen does I have got HD

When you're watching Sky Witness on Sky Q and want to check if you're viewing the channel in HD, look for the HD logo on the screen. The HD logo is typically found in one of the corners of the screen, usually in the top right or top left corner. Additionally, if you're in the guide or menu, High Definition channels might also have "HD" listed next to the channel number (in this case, you would see "108 HD" for Sky Witness HD). If you don’t see the HD logo, it’s possible you’re watching the SD (standard definition) version of the channel. You can switch to the HD version, if available, by navigating to the correct channel number or adjusting your settings.