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Cheers much appreciated.Look for the technical data label on each appliance. It'll give you voltage, frequency, and wattage. Ball park figures, TV 150W, Sky box 45W, Soundbar+woofer 80W+160W, etc. Add up the wattages. I don't think you'll get anywhere near the top end of 3000W (3kW) for 1.5mm2 flex.
If you do go for my suggestion of the Master/Slave extension, you'll need to plug the Sky box into one of 'on all the time' sockets as Sky sends out software updates usually at 2 am.
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