What it is
E570 is a generic fatty-acid additive — most commonly stearic acid or palmitic acid. The source can be tallow (animal fat) or vegetable oil (palm, coconut, cottonseed). Industrial-grade E570 in the EU is overwhelmingly palm-derived today.
Why it matters
Used in confectionery glazes, chewing gum, candle wax, soap, and cosmetics. In food, it's less prominent than E471 or E472 but still common in coated sweets.
What to do
Default assumption is plant in modern UK food. For cosmetics — especially older formulations or "natural" brands — tallow-derived E570 is still used. Ask the manufacturer when in doubt.