Scented candles get a lot of scrutiny in the UK press, and some of it is fair: cheap paraffin candles can release soot and volatile organic compounds when burned in a poorly ventilated room. The good news is that this is mostly a wax-and-wick problem, not a scented-candle problem. Look for soy, coconut, or beeswax rather than paraffin, and a cotton or wood wick rather than a metal-cored one (lead-core wicks have been banned in the UK for years, but zinc-core wicks can still shed trace particulates). Fragrance itself is not automatically "toxic" — candles sold in the UK must comply with CLP (Classification, Labelling and Packaging) regulations, and reputable makers list their fragrance allergens clearly on the box rather than hiding behind a vague "non-toxic" sticker. The picks below all use natural waxes, cotton wicks, and clearly labelled allergens.