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By the time she smells a third perfume, 34-year old Helen Ellis’s head is beginning to pound. Already overwhelmed by the noise and bright lights in the busy store, the addition of scent is too much. Helen was diagnosed with autism more than a decade ago, placing her among the estimated 15 per cent of the UK population who are neurodivergent. That means she is more likely to experience sensory overload, a state where one or more senses are overwhelmed, leading to stress, discomfort and anxiety.