Is that the power cable or hdmi cable?
If a power cable, read the information here for getting a replacement
https://helpforum.sky.com/t5/Sky-Glass-Live/Want-new-power-cable/td-p/4961448
If it's your hdmi cable, you can buy them easily online.
Make sure if you buy one online that especially if your using UHD, that it's listed as an 'high speed 2.0' hdmi cable and it's no more than three metres in length.
You can also buy an hdmi cable that mentions the 2.1 standard, but that is not really necessary, it will probably cost a little more.
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