Usually the ferment will start within 24 hours, but if temps are cool it may take longer. Also when you add the yeast you need to sprinkle it on top of the cider so that it rehydrates evenly, just dont dump it in or it will take longer.
Since you are in the UK, I'm assuming that you are using Youngs cider yeast, which is OK, but I'd recommend trying Brupak Ale yeast - it works great for cider
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